I can see already I need a bigger skimmer, but what chemicals should I invest in for starters? Ther are only 2 corals in the tank right now. 1 large piece of what I am told is leather and somthing else I am not sure what to call it. There are about a dozen fish (clowns, coral beauties, damsels, ect...), sea cucumbers, eruchents(SP?), starfish, and lots of snails.