Glofish Tank Size Chart / How Many Glofish Can Go In A Tank?

GloFish are fascinating fish with vivid colors. The fish were given a natural fluorescence gene, resulting in fish that are fluorescent at all times.

GloFish are all captive-bred, and their fluorescent hue is a result of natural breeding. 

Fireflies shimmer and flicker as they perform their mating dances, changing a pleasant summer evening into a spectacular one.

While the bioluminescence that permits these insects to glow and earn the nickname “lightning bugs” fascinates people, it is a common feature in animals, particularly fish and other marine creatures.

The capacity to emit light isn’t merely a show-off quality; bioluminescence can help an animal compete.

Deep-sea vampire squids, for example, release glowing mucus to frighten predators, and hatchet fish employ light-producing organs to modify reflections off their bodies, hiding from prey hunting from below.

Plankton, coral, and glowworms are species that glow or flash to gain an advantage at sea or on land.


Average Size (Adult)2 inches 
LifespanUp to 3 years
Aquarium size required5 Galloons onwards
Water temperature requiredBetween 72 and 82ºF

What are the Characteristics of GloFish?

They have a brilliant color enhanced by a black light, and they come in a variety of vibrant colors.

They absorb light and then re-emit it, giving the appearance of “glowing.” Maintaining them in a group of five or more is advisable since they are “schooling fish.”

Popular Types of GlowFish

  1. Danio– Danios are little schooling fish with two distinct patterns: zebra and leopard. They can grow up to 2 inches long and eat a variety of foods.
  1. Tetra– Another energetic schooling species, tetras, are slightly bigger than danios and prefer planted aquariums. GloFish tetras are most closely related to Black Skirt Tetras, which occur in short-finned and long-finned varieties.
  2. Barbs– Barbs are a collection of animals that are all schooling species that tend to be housed in groups of five or more. GloFish barbs have dark vertical striping in addition to their brilliant color.
  3. Sharks– Sharks, the newest GloFish species, are comparable to Rainbow Sharks. These omnivore fish can grow up to 6 inches in length and are semi-aggressive.

What You Need to Know About GloFish Care

GloFish are freshwater aquarium fish, which is the most crucial thing to remember. They prefer to be housed in groups of five or more of their type, just like their non-fluorescent counterparts.

They also thrive in communal aquariums if there are no aggressive or predatory species.

What Size Tank Do You Need for GloFish

Twenty gallons might be a good place to start so you can have a handle on maintenance and care before going smaller.

Remember that you’ll need to create ideal living circumstances for GloFish to grow and live a long life.

If you want to achieve that, take an Aquarium Filter, a replacement kit, and an aquarium test kit to check for water toxicity before introducing fish to the tank.

Aquarium gravel will be required. The gravel should be dark so that it contrasts your GloFish, coarse enough to allow water flow, and dark enough to allow nitrifying bacteria to develop.

How many GloFish are Ideal for a 10 Gallon Tank?

A 10 gallon tank is a great starter tank size for beginners. One thing you should know is that when stocking small sized tanks, it is important to not go overboard, and always try to keep some legroom for the fishes.

You can safely put in one to three glofish in a 10 gallon tank.

Ideal Diet for GloFish

Flakes, pellets, frozen or freeze-dried food are all part of a well-balanced GloFish diet.

 Change the diet of GloFish to maintain a healthy nutritional balance, and include foods high in carotenoids and beta carotene to help them maintain their brilliant colors.

When feeding your GloFish, it is important to remember that it’s best to feed modest amounts twice a day and not more than the fish can take in 1 to 2 minutes.

Why do Glofish Need to be in Groups?

The majority of Tetras and Danios should live with their brothers. This means they’ll swim in the same direction and coordinate their strokes.

When Glo tetras and Glo tiger barbs are not in schools, they are known to become antagonistic.

If too few of the same species are housed together, they could succumb to death due to loneliness. These are creatures that thrive in groups. I’d recommend having at least a couple of those for anyone interested in owning an aquarium.

They bring the aquarium to life and are, dare I say, more exciting to watch than most television programs.