i will describe my tank before i begin to ask my questions :) it is a (US measurements) 55 gallon 48x12x21 tank. it has a pair of puffers, 4 mollies, 4 platys, 2 hoplo catfish, and 1 green scat (scatophagus argus argus i believe, spots with no stripes) before i had the puffers and scat i heard...