I got a 45 gallon tank...Theres a couple big plain corals in there and some little rocks...i got an emperor 280 for a 50 gal tankand it keeps the water crystle clear...I have 2 percula clowns, i wanna get an anemone...2 3 stripped damsils, 2 little yellow tangs, a choc. chip star and a shrimp...