So I've decided to sell my canister filter for my 75g FOWLR setup. I have 2 maxijet 1200's, worth a combined 590gph. Assuming I will be getting a skimmer, will I also need a H.O.T filter for carbon and such, or will a skimmer be enough along with my powerheads? I can get a H.O.T. filter rated at 310gph for about $30, plus a cpr bakpak for another $90. But do I need the filter?