I been dreaming and planning over starting a 40b reef, and using my currently freshwater 20 long as the sump. That's a long ways off, so I was thinking about starting the 20 long up with a very minimal setup. I have an AquaClear 50, LED lighting and a heater already so I was wondering if I could add a power head and successfully run this as a FOWLR, with weekly maintenance of course? For stocking I'd be happy with a pair of clowns, but would also like to have a pistol shrimp/goby pair if space allows.