well i bought an established tank so i did not have an option of choosing which tank setup to get. the tank came with 2 canister filters.
so i have done some reading and it looks as if building a sump is my only real option. my question is, how large of a sump do you need? since i have a 75 gal. tank should i make something like 20-30 gal. i'll do more research on how to build one..also the back of the tank is not predrilled and i'm not sure if there are holes drilled in the bottom of the overflow. how should i get around this...my tank is setup and i don't want to tear it all down again.