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Follow the 1 inch per gallon rule, for every ince the fish is long, that is how many gallons the fish needs to live in. If you wish to get a neon tetra (2 inches) you could have 1, but a tetra is a schooling fish and needs to be kept in groups of 5 to 6. You may want to consider a betta fish, you could have 3 females in the tank or 1 male. (bettas and goldfish are an exception to the 1 inch rule bettas need 1 gallon, goldfish need 10 gallons)

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Q: How many tetras could you fit in a 3 gallon tank?
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What fish do well in a 36 gallon tank?

You could have a school of neon tetras (approx 6), or 1 fancy goldfish


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