A 75-gallon tank isn’t for everybody. Creating a stable and thriving aquatic environment is tricky enough as it is. Getting your aquarium to 75 gallons is pouring fuel over a fire.
The extra space will come with various challenges, including financial in nature. You will naturally need more substrate, more plants, more decorations, more rocks, and, of course, more fish.
On the other hand, a 75-gallon setup is more self-sustainable and easier to maintain than smaller tanks.
That’s because the environment is larger, which means that the chemicals get cycled around more effectively. But what fish should you use for your 75-gallon aquarium?
Stocking Ideas for 75-Gallon Tank
You can stock 75 gallons planted tank with various fish species such as angelfish, discus, tetras, livebearers, gouramis, ram cichlids and rainbowfish. All these fish species do really well in planted tanks and don’t eat plants.
The angelfish grows up to 6 inches and gets its name from its wide and loose fins, imbuing the fish with an angelic presence. This species is a great addition to larger setups and can live up to 12 years with optimal care.
They are feistier and more energetic than many other species, as they patrol their environment relentlessly during the day. Part of that is due to their territorial tendencies and high energy during the breeding season.
Fortunately, the angelfish is hardy and adaptable and can cope with a variety of environmental conditions.
These are tropical fish, so you need to provide them with adequate temperatures to keep them active and healthy. Angelfish prefer higher temperatures in the neighborhood of 75 to 84.
They can withstand some slight variations, but not by much. The fry require higher temperatures since they display a more accelerated metabolic rate. Providing them with temperatures above 82 will boost their growth rate considerably.
Other than that, you should provide your angelfish with various plants and decorations, as long as they’re safe. Angelfish possess long and wide fins, making the fish vulnerable to sharp or rugged decorations.
Stiff and abrasive plant stems could also damage their fins, especially since the angelfish is quite an active species.
Consider the fish’s tankmates carefully. The angelfish likes to live in schools of at least 4-6 specimens, but this may differ. Angelfish may differ in terms of personality and overall behavior.
These fish rank as semi-aggressive, so fighting each other over space, food, or reproductive dominance is not uncommon.
Don’t pair them with fin nippers since these can stress out your angelfish, affecting their health in the long run. Livebearers make for decent tank mates, especially since the angelfish will eat their fry, keeping their population under control.
I’m thinking guppies, but you can also use other species, like tetras, cory catfish, mollies, etc.
This cichlid grows up to 8 inches, although you’ll most likely get it at 6 max. Discus fish are intelligent, peaceful, and slow swimmers that will adapt to their environment quick.
They make for great aquarium pets, thanks to their adaptability and resilience, but they’re rather shy.
These fish display an astounding variety of colors and patterns and can even change their colors under some circumstances.
This freshwater cichlid requires temperatures around 82 to 88 F, which is higher than most tank fish prefer.
Given that the discus fish is shy and easily startled, I recommend decorating their habitat with plants and underwater decorations.
Most importantly, remember that, as a cichlid, the discus fish requires ideal environmental conditions to remain healthy and active.
You need to embrace a robust tank maintenance routine to keep the water fresh and clean in the long run.
This makes the discus fish more difficult to care for than other species. So, I only recommend this species if you’re already experienced in the fish-growing business.
You can easily house 7-10 fish in a 75-gallon setup, provided no other tankmates are present. Finding the right tankmate for them can be a challenge. Avoid fast, aggressive, or overly inquisitive fish that could stress or bother your discus too much.
The ideal tankmate is a slow swimmer with a friendly temperament and similar environmental requirements.
It’s also important to note that discus fish are naturally territorial, as is the case with cichlids in general. So, they tend to get into territorial fights if they feel crowded or stressed out.
A tank layout consisting of multiple caves, rocks, plants, and other hiding areas is necessary to mitigate their aggression and keep them calmer.
Tetras make for a great addition to any aquarium, no matter the size. But I think they will fit a larger tank even better because they are relatively small and display schooling behavior.
These fish will only grow up to 1.5 inches and don’t need much care to thrive. They rank as hardy and resilient fish, capable of adapting to a variety of setups.
Tetras require stable temperatures around 70-80 F. They have quite a generous temperature range, thanks to their astounding resilience.
The minimum tank size for these would be 10 gallons for a small school, but you can fit a lot more in a 75-gallon setup.
In fact, I don’t think you can create a 75-gallon environment for tetras only. I mean, you can, but there’s no point in doing that. Tetras are small and active fish that thrive in pretty much any environment.
There’s no point in having 30-40 tetras in a 75-gallon tank unless you are absolutely enamored by them.
Otherwise, I advise finding them some compatible tank mates for a plus of visual and social diversity. Tetras don’t mind the presence of other fish species, provided there’s enough room for all of them.
Tetras show a maximum lifespan of 8 years in captive conditions in the ideal conditions. They only need stable temperatures, clean waters, and a variety and optimized diet and won’t ask for much else.
These fish display an astounding color and pattern diversity, providing you with a wide selection pool.
When looking to accommodate your tetras to their new environment, consider the following:
- Tetras demand low-light conditions
- They need an omnivorous and varied diet to remain healthy
- Don’t pair them with fish with large fins because tetras are notorious fin nippers
- Despite their hardiness, tetras are vulnerable to diseases like Ich and fin rot; so impeccable water conditions are necessary to prevent those
- The ideal tankmates for tetras include barbs, gouramis, cory catfish, other tetra strains, etc.
Livebearers from the most popular group of fish today. The notion of a livebearer refers to the fish’s reproductive behavior. Some fish lay eggs, while others produce live fry after the eggs hatch inside their bodies.
So, technically speaking, livebearers are also egg layers. It’s just that they don’t lay the eggs but have them hatch inside them.
The most notable livebearers include guppies, mollies, platies, and swordtails, to name a few.
Their most distinctive characteristics include:
- An omnivorous diet, making them easy to feed
- Adaptability and resilience to various environmental conditions
- Schooling or shoaling behavior, allowing the fish to find strength and safety in numbers
- A shy but friendly and calm demeanor, making them perfect tankmates for a variety of species
- The highest color and pattern diversity, especially for guppies
- The easiest fish to breed in captivity available today
- The ability to produce fry every month, often in the hundreds with each spawn
Needless to say, livebearers are ideal for a 75-gallon tank since this provides them with more space than they could ever need.
After all, most livebearers only grow up to 2-2.5 inches. So, you can keep multiple schools in the same setup.
Aim for temperatures around 72-82 F. These should accommodate most livebearer species. Heavily-planted setups are also recommended since these fish are easy to intimidate.
More aggressive, territorial, or curious fish can stress them out, at which point they may feel the need to flee and hide.
Add sufficient plants and decorations to keep the fish safe. Doing so will make them more prone to roaming their environment and greatly boost their coloring.
Livebearers can be territorial towards one another if they feel crowded or during the breeding phase. Males are especially dominant and aggressive towards each other.
So, always monitor their interactions and try to mitigate their behavior if their violent outbursts become too frequent.
Also, keep in mind that livebearers are often used as feeder fish due to their small size and breeding prowess. Choose their tankmates carefully. Pairing them with the wrong fish species can quickly turn your livebearers into prey.
Gouramis make for a special entry due to the fish’s astounding diversity. Not only do gouramis differ wildly in terms of color and patterns, but they also differ based on size.
A gourami could measure between 3 and 28 inches, depending on the species.
This means that you need to pick your gourami carefully since they have different needs based on their size. This can be a serious challenge in and of itself, considering that we have around 90 species of gouramis today.
These are the result of human-guided selective breeding, aiming to prioritize certain features and traits.
The fish’s lifespan varies based on numerous factors, such as water conditions, diet, and, most importantly, the species. Some gouramis only live up to 3 years in captivity, while others can go as far as 8 years.
The ideal water temperature sits at around 72-82 F with a water hardness of 15 dGH tops. These are standard requirements that apply to most tropical fish.
This means that finding the right tankmates for your gouramis should be easy enough.
Gouramis are labyrinth fish that can breathe atmospheric air at the water’s surface. They are similar to bettas in this sense.
So, you should consider this trait when creating their environmental layout. Gouramis are mid-to-top dwellers, so you need to make sure that they have easy access to the water’s surface.
These fish are omnivorous and hardy for the most part. They will take time to adapt to a new setting, but once they do, they will thrive.
Just remember to pair them with peaceful and slow-swimming fish that will reflect the gourami’s own personality.
Over-active fish will cause the gouramis to starve since they won’t be able to keep up during feeding time. Some of their best tankmates include the danios, Corydoras, rasboras, and tetras, to name a few.
Bottom-dwellers like plecos or other catfish are also welcomed since they will rarely cross paths with the gouramis. Especially in a 75-gallon environment.
Also, remember that make gouramis are extremely territorial and competitive towards one another. You might want to separate them and only keep a harem (one male and several females) in your 75-gallon setup.
If you do want to keep more male gouramis, make sure there are at least 3-4 females for each of them. And that they have plenty of space to go around.
Omnivorous, peaceful, colorful, and easy to care for. These characteristics make the rainbowfish one of the most beloved species you can get.
There are around 50 different types of rainbowfish to choose from, many of which are the result of selective breeding.
The rainbowfish is easy to maintain and can tolerate an impressive range of water conditions. They can live up to 8 years with proper care, although the average sits at around 6.
Go for a water temperature of 74-80 F for your rainbowfish with hardness values up to 20 dGH. Their ideal environment is one with fast-moving waters since these fish love to swim against the current.
This means that their tankmates should prefer the same conditions.
The minimum advisable tank size is 15 gallons for a small school. So, 75 gallons are more than enough to fulfill the fish’s needs. Remember, these are schooling fish that rely on their numbers for safety.
They need to have sufficient space at their disposal, especially since they’re some of the most active swimmers you can get.
Rainbowfish are notorious for their high energy levels. So much so that they’re made a reputation for themselves as jumpers.
Rainbowfish will jump out of your tank if they’re stressed, starved, or simply crowded and feel the need to explore outside of their habitat.
So, always have a lid on to prevent them from jumping out.
Their ideal habitat is planted and with steady water currents – a setting which may be difficult to achieve, given that most plants don’t fare well in fast-moving waters.
I recommend anubias, hornwort, or Amazon swords as good candidates in this sense, but feel free to experiment with other species as well.
Ram cichlids, or German blue rams, are notorious in the aquarium world thanks to their beauty and astounding presence. This species is very much atypical, considering the profile of cichlids in general.
In short, ram cichlids are friendlier and more peaceful than other cichlids, although they are similar in many other areas.
Ram cichlids remain small, in the neighborhood of 3 inches in the case of males. They are omnivorous and live up to 3 years with adequate care.
In typical cichlid fashion, ram cichlids prefer higher temperatures (around 80-86 F) and demand a variety of hiding areas.
Especially since these cichlids are shier than other species.
A rocky setup is ideal for them, preferably with a lot of caves, rocks, driftwood, and plants. Keep in mind that ram cichlids, and cichlids in general, are mid-to-bottom dwellers.
They will rarely reach the water’s surface, so you need to feed them sinking pellets.
Also, don’t pair them with overly active top dwellers since these will eat the cichlids’ food, causing them to starve as a result.
Ram cichlids are highly intelligent and will begin to recognize you over time. Despite being relatively shy, these cichlids are also active swimmers, so they need a lot of open space as well.
While they are generally peaceful in their ‘off-season,’ males can get feisty and territorial during the mating-and-breeding phase.
It’s worth noting that ram cichlids are very sensitive to the water’s quality. They are also vulnerable to some conditions like fish tuberculosis, Ich, fin rot, and skin flukes.
Fortunately, the primary trigger of these conditions is poor water quality.
Monitor ammonia levels, clean their tank regularly, remove fish waste and food residues, and perform partial water changes weekly.
Also, choose the cichlids’ tankmates carefully. Avoid aggressive or territorial species and stay away from dirtier species like goldfish.
These are notorious for producing a lot of poop, fouling the habitat more often than you would like.
A 75-gallon setup is designed to make an impact. Naturally, your first instinct is correct – create a lush, carefully crafted setting for the most impact.
In this sense, every detail counts. This includes the plants to use, the overall layout, the substrate, and the fish species.
I’ve provided you with several fish options to consider, but there are many more that could fit the requirements.
Just make sure they’re compatible with one another regarding water requirements, temperament, diet, etc.
The larger your aquarium, the more fish you can include in a fish-in cycle. Rule of thumb: One fish for every 10 gallons of water. So, if your tank is 1 gallon, only 1 fish. If your tank is 58 gallons, 5 fish.Can a bala shark live in a 75 gallon tank? ›
That body type is found in active and fast-moving species. While some species that reach a similar size can be housed in a 55- to 75-gallon tank, the bala shark would find such conditions very cramped and likely displace a lot of water in its quick bursts across the tank.How many angel fish can you have in a 75 gallon tank? ›
A 4-foot long, 75-gallon tank is the ideal tank size for a group of 6 Angelfish. And in many ways, 6 is a great number of Angelfish to go for, since they like to be kept in groups and to choose their own mates.Is a 75 gallon tank big? ›
While it may seem large, the sizable 75-gallon tank is often easier to maintain than smaller aquariums. Large glass aquariums contain more water than smaller tanks, and the large water volume creates more stability in the aquarium's water conditions.How often should you change the water in a 75 gallon tank? ›
You should do a 25% water change every two to four weeks. There is no reason to remove the fish during the water change. Make sure you stir the gravel or use a gravel cleaner during the water change.How often should you clean a 75 gallon tank? ›
If you have a large, well established tank you should clean your tank on a weekly or bi-weekly basis. A water change should be done to the keep the tank clean and the fish happy. Depending on the type of filter you use for the tank, you may be able to get away with cleaning the tank once per month.How big of a tank do I need for 4 bala sharks? ›
Bala Shark Tank Size
So they easily can grow into enormous tank busters. Plus, you shouldn't keep just one Bala shark in a tank, they need to be in a school of five or more. The minimum tank size for this fish, especially if you want to keep other fish with them, is 150 gallons (568 liters).
Even though they can grow to be quite large, the Bala shark is a docile species that does well in a community tank, even with smaller species like danios and tetras. These fish enjoy a tank decorated with live plants, but it is also recommended that you leave open areas for free swimming.Can you have 2 bala sharks in the one tank? ›
The Bala Shark is a beautiful fish with a metallic silver body with a yellow and black dorsal and caudal fin. It requires a large aquarium with driftwood, rocks, and spots of dense vegetation. This shark does best in small groups of 3 or more, as they prefer to school in the aquarium.Do angelfish like heavily planted tanks? ›
Because they are native to the Amazon River, freshwater angelfish prefer a slightly acidic pH between 6.0 and 7.5 and they enjoy a densely planted tank setup.
- Neon tetras.
- Cardinal tetras.
- Bristlenose plecos.
- Cory catfish.
- Kuhli loach.
For a 29-gallon community tank, keep no more than four adult angelfish with other tank mates. For a 55-gallon tank, start with five or six juvenile angelfish and be prepared to remove some in the future if they get too territorial.How heavy is a full 75 gallon tank? ›
New Tank Syndrome is a term used to describe problems that occur due to the build-up of invisible, toxic compounds in an aquarium. It gets its name as the issue is most likely to occur when your filter is maturing when starting a new aquarium.Can you do too many water changes in tank? ›
It is possible to do too many water changes in an aquarium. The maximum frequency of water changes should be once per day. If you choose to perform daily water changes, be sure to only replace half of the tank's water to avoid disturbing the tank's biological balance and stressing your fish.What temperature should a 75 gallon fish tank be? ›
A good range is 76° to 80°F (25° to 27°C). A few species need to be kept several degrees warmer, and some species require temperatures a few degrees cooler. A thermometer is vital. A stick-on type enables you to check the temperature whenever you look at the aquarium.Why is my 75 gallon tank cloudy? ›
This phenomenon occurs when your tank has excess nutrients, fish waste, or decaying food in the water and a limited quantity of beneficial bacteria to eat it. This situation tips off the system and forces the bacterial colony to reproduce more. The explosion of the population often makes the water have a milky haze.Where do you put fish when cleaning a tank? ›
Use a small bowl, mug or cup that has been thoroughly rinsed with distilled water as a temporary tank. Never place fish in containers that have been washed with soaps, as even a small amount of residue can be toxic. In a pinch, you can also use a large plastic zip bag.Do you remove fish when cleaning tank? ›
It's best to keep your fish in the fish tank when you clean. Removing them causes unnecessary stress for your fish, and you run the risk of accidentally hurting them. It is possible to keep your fish in the tank while you clean because you don't need to remove all the water to clean the tank properly.Can Bala sharks live with red tail sharks? ›
Definitely one of the larger tank mates for red tails you'll want to consider, it's important to be sure that there's a lot of water for your balas to move around in.
Angelfish can be a little bit of a controversial pick for tank mates with your Bala sharks, if only because they have a bit of a reputation for being a little “finicky”.How big will a rainbow shark get? ›
These fish have a distinctive appearance: long, dark bodies, pointed snouts and a flat abdomen. Their fins are typically red/orange in color. When fully grown, rainbow sharks can reach 6 inches in length. They're highly-territorial fish and are prone to aggressive behaviors towards other, smaller fish.Can I keep a rainbow shark and a Bala shark? ›
A shortlist of fish that make terrible rainbow shark tank mates are: Bala sharks. Red tail sharks. Cichlids.How big will a Bala shark get? ›
Appearance and anatomy. These fish have a silver body with black margins on their dorsal, caudal, anal, and pelvic fins. They have big eyes to find and catch their prey. The bala shark will grow to a maximum length of 35 cm (14 in).What size tank do silver sharks need? ›
For a group of juveniles a 200L tank would be sufficient to allow them to grow at a healthy rate and provide enough space for them to swim, play and hide. Adult Silver Sharks require more space, than juveniles. A 500L aquarium is suggested for a group of mature, large silver sharks.Can you keep 2 rainbow sharks? ›
Rainbow sharks are not likely to kill other fish. They will however be semi-aggressive towards other sharks. That's why for most aquariums I wouldn't recommend more than one. If you decide to have more than one, make sure it is an at least a 40 gallon and up as they will tend to be very aggressive towards the other.Can I put bala sharks and tetras together? ›
This fish is well known for its congenial manner, and they tend to do well living with many other different fish species. Some great tank mates for Bala Sharks are: Rainbowfish. Tetra.Are rainbow sharks real sharks? ›
It is a popular, semi-aggressive aquarium fish. Unlike true sharks, which belong to the Chondrichthyes ("cartilagenous fishes") lineage, the rainbow shark is an actinopterygiian ("ray-finned fish").Do fish tank plants oxygenate water? ›
Another excellent source of oxygen in an aquarium, and in many natural bodies of water, is plants. Plants produce oxygen as a by-product of photosynthesis, a process by which plants use light energy to produce food from carbon dioxide and water.Can a tank be too planted? ›
Generally, an aquarium can not have too many plants. As long as your fish have space to swim, you can't really overdo plants. Even thick plant cover simulates the natural habitat of many fish, especially small community species like livebearers that are typically prey in nature.
Live aquarium plants are another method of removing toxic nitrogen waste from the water because they consume the nitrogen compounds as food and use the nutrients to grow more leaves. The more plants you have, the more fish the aquarium can handle.How much seachem Can I put in a 75-gallon tank? ›
Use 1.25 g (1/4 tsp.) for every 1,250 L (300 US gallons) as needed to reduce chlorine and chloramine or use 1.25 g (1/4 tsp.) for every 300 L (75 US gallons) for ammonia. For precise dosing, use the Seachem Digital Spoon Scale.What is the best filtration system for a 75-gallon fish tank? ›
Best for 75-Gallon
For large, 75-gallon tanks, our pick is the Seachem Tidal Filter. It has a flow rate of 350 GPH, and a self-priming pump and self-cleaning impeller for easy maintenance. An alert feature also lets you know when your filtration setup needs to be adjusted or otherwise inspected.
The 75-gallon aquarium measures 48.38” W x 18.38” D x 21” H.Are angelfish top or bottom feeders? ›
Angelfish are top water dwellers that spend most of their cruising near the surface.
Angelfish are easy to care for and can live up to 10 years in captivity if they are provided with proper aquarium conditions.
On average, juvenile Angelfish continue growing until they become sexually mature. The exact timeline differs per species, but they typically reach the age of sexual maturity by the time they're 8-12 months old. Their size at this time should be their full adult size.Does a bigger tank take longer to cycle? ›
When it comes to cycling a fish tank, larger tanks will take longer to cycle. This is because there is more water to process and filter. And yes, you NEED to cycle your tank!How many fish can you add to a new cycled tank? ›
A good general rule for most tanks under 100 gallons, never add more than 2-3 fish at one time and no less than 2 weeks in between new additions. This gives the beneficial bacteria foundation time to "cycle" based upon the new addition of nutrients (fish food and poo).What fish can survive a tank cycle? ›
Other fish suitable for cycling a freshwater aquarium include nonfancy guppies, Corydoras paleatus, C. aeneus, X-ray tetras, pupfish and some of the hardier labyrinth fish, such as banded gouramis and paradisefish.
Wait until both the ammonia and nitrite levels have risen and then fallen to zero before adding more fish. It usually take about 3-6 weeks for a new aquarium to go through the initial nitrogen cycle, so fish should be added only a few per week during this time.What are the symptoms of new tank syndrome? ›
Symptoms. New tank syndrome leads to ammonia toxicity in the fish, which can quickly become fatal. Fish will often die suddenly, without warning. The aquarium water is frequently cloudy and smelly due to the excessive ammonia and nitrite levels.Does algae mean your tank is cycled? ›
At some point in the process, you'll notice the beginnings of life in your sterile tank, in the form of an algae bloom. This is a sign that the cycle is nearing completion – there are enough nitrates in the tank to support algae.Can I put fish in tank same day I set it up? ›
Typically, you should wait at least 24 to 48 hours and even up to a week before adding fish to a new tank. Waiting ensures that all the set conditions for the ecosystem have had time to establish themselves. This also gives your fish enough time to acclimate to their new environment.Should you do water changes when cycling a tank? ›
Are water changes necessary during cycling? While not essential, we recommend water changes during cycling, although opinions differ. Since bacteria live on surfaces, removing water does not disrupt their development. Water changes can help control the amount of ammonia in the first stage of the aquarium's life.Do plants help cycle a tank? ›
Cycling with Plants
All the more reason to go for a planted tank! (That said, the leaves and roots of the plants will contribute some beneficial bacteria, but you can add even more using the tips mentioned above.) Once the plants (or algae) show new growth, the cycle is complete.
Zebra danios, Danio rerio, are just about the hardiest tropical fish you'll ever keep. They don't mind if the water is hard or soft, still or flowing, warm or unheated, and they are the single best fish for new fishkeepers and new aquariums.How long to cycle a tank with plants? ›
Eventually, even with additions of ammonia, nitrites and ammonia would measure at 0 after a 6hr period, while nitrates accumulate. The ammonia cycling process for the tank is now complete. The entire process can take 4-6 weeks depending on tank parameters.How often should you do water changes when cycling a tank? ›
Aim to do 10-25% water changes every 2-3 days. Any more, and you'll risk removing the ammonia and nitrite that beneficial bacteria needs to feed on. Make sure you add de-chlorinator to the water. Adding chlorine/chloramines will kill the bacteria and ruin the cycling process.Does adding fish food help cycle a tank? ›
A very easy way to begin the cycle in a fish tank is to just add fish food. Adding food for the first day or two, feeding as if there were fish in the tank, will be enough to start the cycle. The food will break down and start releasing in to ammonia, starting the cycle.
Generally, you should aim to do this every few weeks. Sometimes, you will notice detritus worms living inside the gravel. These are small, white creatures. If you see this, it's time to replace the gravel, as these worms will start to cause the material in the tank to decay.How long does it take for beneficial bacteria to grow in an aquarium? ›
Normally, it takes 4 to 6 weeks for the growth of beneficial bacteria to complete the nitrogen cycle in a new aquarium. It is not unusual for seeded aquariums to fully cycle in half the time it would normally take, thus allowing you to stock more fish in the new tank sooner.