is it the coralife T5-High Output duel bulb unit?Also what is the tank size?if its not to wide and not too deep then you can keep alot of kinds of corals in the tank.Many type of soft corals ,LPS,Chalices,ecrusting corals.Tostart off the easy corals that come to mind,or beginner corals, are green star polyps,blue clove polyps,many types of zoanthids and palythoas,mushrooms,leather corals,kenya tree corals,ect.When your perameters are stable I will giv e you some coral to start off with so feel free to drop me a line to get some starter cuts.