09-09-2013, 02:27 PM
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Originally Posted by Juggernaut122
I was going by the 1 inch of fish per gallon - the fish are about 3 inches each. I know people debate about his approach.
We did just add 4 danios which I was told would only be about 1 inch when fully grown...which would make the 10 inches for 10 gallons.
I hate this rule. People always forget the part about it only applying to small shoaling fish. Mollies aren't that. Male Poecilia sphenops get 3 inches, females get closer to 5. Poecilia latipinna is 5 inches for males and 4 for females. Poecilia velifera reaches 6 inches for males and 7 for females. Bigger fish have bigger bioloads, so in short mollies pretty much need a 29 gallon or larger. The 29 gallon only even works for P. latipinna. The other two species need slightly bigger.
Some danios will reach slightly over an inch, usually around 1.2. Most danios are just too active for a 10 gallon. Not sure what species you have, but even the zebra danio can reach two inches and needs a 20 gallon.