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Aug 04, 18 · I used to keep 40 neon tetras in a heavy planted 25gallon tank without problems Things could have been different with another fish species There are two good ways to know how many fish an aquarium can hold First, each fish species have its requirements in terms of space Some will need plenty of places to swim around while others don't10 to gallon aquariums are considered as the starting tank when keeping goldfish as pets These tanks are not recommended for long term use One inch of fish per one gallon is the general rule used to determine the tank size or the number of goldfish to be kept in a tank of a particular sizeAccording to this rule, my 25gallon aquarium could hold a maximum of 25 neon tetras (one inch each) or 12 goldfish (two inches each) Unfortunately, a single 2 inches goldfish will probably produce Pin On Cool Fish Tanks 14 gallon tank how many fish