Not at all! I'm putting around 43 fish into a 55 gallon tank... you're think more along the lines of the rule of thumb, 1" of the fishes maximum size per gallon of water, HA! Think of it like this, goldfish need 20 gallons of water per fish and they can get upto a foot, where as neons grow only to max 1.5" and need 20 gallons of water every 15 fishapply that rule very loosly, if your tank is well set and you have good filtration and a good air pump then 60 fish in a 90gallon could even work
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Please stop, you're giving out false information well maybe not quite false but not entirely correct . The rule of thumb only works for small bodied fish like barbs, tetras and so fourth. You cannot put a ten inch fish into a ten gallon tank. And whats this about goldfish growing upto a foot? Nonsense! Koi can but they need 300 gallons plus. Fancy goldfish need 20 gallons per fish but these don't grow a foot, alot less! Fishkrazy1 think about what you're saying before you say it, no would recommend a 13+ inch koi in a tank thats only 20 or less inches long.