Hello all, decided to get a protein skimmer for my 125 FOWLR tank, Has to be hang on the back. First off If I go with one smaller than "recommended" like say for a 65 or 75 gallon tank(it's space issue) it'll still work right ? It just may fill up the collection cup faster. Any recommendations for a descent model or brand that doesn't cost $ 400. I was really looking to spend somewhere between $100-200. Thanks !