What is the Biggest Fish You Can Keep in a 29 Gallon Tank?

Are you looking for the perfect fish to fill that 29-gallon tank sitting in the corner of your living room? Well, we’ve got the inside scoop on the most amazing fish species that are not only suitable for a 29-gallon tank but also make brilliant showpieces. Buckle up because we’re going to dive into everything you need to know about the largest fish you can keep in a 29-gallon tank.

Fitting a large fish in a 29-gallon tank might sound a tad impossible, but it’s not as challenging as it seems. To make the best choice, it’s essential to understand the fish’s size, behavior, and compatibility with other fish.

So, let’s swim right into this fascinating world of fish and discover some wonderful options for your home aquarium.

Fish Size Matters

When it comes to picking the biggest fish for your 29-gallon tank, it’s not an easy task. You’ll need to focus on fish species that won’t outgrow their environment or crowd out their tankmates. Here are some ideal fish species that would make splendid additions to your home aquarium:

  1. Angelfish
  2. Electric Blue Acara
  3. German Blue Ram
  4. Pearl Gourami
  5. Kribensis Cichlid


While some angelfish can live in a 20-gallon tank, larger tanks like 29-gallon are ideal for these majestic fish. Keeping one or two angelfish in such a tank size allows them enough space to swim gracefully and show off their stunning fins.

Electric Blue Acara

An Electric Blue Acara in a 75-gallon tank might seem more appropriate, but a single specimen can do just fine in a 29-gallon tank. These colorful and peaceful fish add intrigue to your aquarium but require hiding places such as rocks and caves.

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German Blue Ram

The German Blue Ram is an attractive, small, and peaceful cichlid that can be comfortably housed in a 29-gallon tank. A pair of German Blue Ram fish in a 40-gallon tank would be great too. Make sure the tank is heavily planted and has a gentle water flow.

Pearl Gourami

A pair of Pearl Gourami can thrive in a heavily planted 29-gallon tank. As labyrinth fish, they breathe air from the surface, which makes them a low-maintenance addition to your aquatic paradise.

Kribensis Cichlid

Even though the Kribensis Cichlid is a dwarf cichlid, it is an active swimmer and a fantastic addition to a 29-gallon tank. Ensure the tank is furnished with hiding spots and a sandy substrate to accommodate their burrowing habits.


  • How many fish should I add to a 29-gallon tank? It largely depends on the fish species and their size. As a general rule, follow the “1 inch of fish per gallon” guideline.
  • Do Angelfish pair well with other fish in a 29-gallon tank? Yes, they do. Avoid housing them with aggressive species or fin-nippers like Tiger Barbs, and opt for peaceful companions like Tetras, Corydoras, and Gouramis.
  • Do large fish have specific tank requirements? Ensure sufficient hiding spots, plants, and tank decorations to make the larger fish feel secure and comfortable. Also, check the water parameters such as temperature and pH values.
  • Can I add bottom-dwellers to my 29-gallon tank with big fish? Absolutely! Bottom-dwellers like Corydoras or Plecos make great additions to your tank with big fish, as they don’t compete for space and help maintain the tank’s cleanliness.
  • Should I use a heater for my 29-gallon tank with big fish? It mostly depends on the fish species you’re keeping. Tropical fish like Angelfish and German Blue Ram require a heater to maintain a stable water temperature.
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In conclusion, there’s no one-size-fits-all answer to the biggest fish you can keep in a 29-gallon tank. However, knowing your options and understanding their requirements can make a huge difference in creating a spectacular aquarium. By selecting the right fish, you’ll bring vibrant color, life, and tranquility to your home, one species at a time.

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