ok i wanna do a salt tank but i cant really do a sump i know there best and i know that most salt water guys will say that canisters are a nitrate trap but what if a guy broke up live rock and used just that in the canister?? eliminating the sponges aswell?? its gonna be a FOWLR for now just to get me into it then once my 2500gal is built in the garage for all my cat fish and rays ill convert my 8ft 240 gal drilled tank to salt aswell but i've been waiting long enough to set up salt lol. oh im gonna really try and sell the 55gal that i wanna convert to salt but selling fish stuff even fish for that matter in my area is really hard to do so and i dont want to just give everything away so if i cant sell the 55 ill just use it. and i know a deeper width would be better in say an 80gal and up but oh well thanks guys!! and ill do a hang on skimmer too. how important is the skimmer if im only gonna keep a few smaller fish???