i like the look of a slightly over stocked tank. curently i have a 55g with 2 dempseys one 2 inch and one 6 inch, 3 severums 2 green and one red spotted gold all about 2-3 inches, one firemouth about 1.5 inches and one salvini about 2 inches. for filtration i have a AC 110 replaced the carbon for more biomax and a AC 50 with thesponge,carbon,biomax. my question is with my stock list do i need more biomax? can someone explaine to me how it works? like what the perks are forreplacing carbon with biomax? thanks.