Some may have read my other posts indicating that I'm going to have to part with my sumps and switch to canister filters. One issue that I've not addressed yet are those overflows. How would I go about removing them? Also, I can simply just plug the 4 holes in the bottom of the tank and cover with gravel right? I'm planning on running 2 Fluval FX5s and an Aquaclear 110 in place of two AGA Model 3 sumps, for those wondering.