Well, I`ve gotten my feet wet (pun intended) in the freshwater hobby with eight tanks and counting, Including cichlids and heavily planted tanks, and want to get a saltwater. I already have a twenty gallon tank with a power filer, a U.G.F. run by a n air pump, and a canister filter, what else do I need regarding filters? Do I need any of those fancy protein skimmers, wet/dry filters, or U.V. sterilizers if I`m just setting up a FOWLR with all hardy specimens? I have a small budget, and don`t want to be spending hundreds on filters. Also, what substrate would be best? I need help!!