surface area is in sq inchesBushFishRox;1104955; said:12" of water times 12" of fish is 144" or 12ft so I just folded that in half rather then say you need a 12'x1' tank...

or do you really mean 1" of fish per 1"sq of water? since you say a 12" fish would need 1/12 of a 12sq ft tank? because the way you word it means that a 12" fish needs 1sq ft of water...

so for a 12" fish you would want 144"sq which is only 12"x12" piece of the tank

so if you tank is 36"x12" you would have 432"sq to use

I think this would work well for smaller species, but a 12" fish is gonna need more space than 3' to swim I would think.

for a 3" fish you could have 12 in this size tank... this size would be about 35 gal right? so by the inch/gal you could have 12 fish about. seems good to me.