Am fairly new to marine after been freshwater for 8 yrs made the leap!! have a 4ftx2ftx15" tank with 2ftx18"x15" sump. metal halide lighting,fluval 404 exrenal filter plus uv sterilizer.skimming is done with deltec apf 600. tank has green chromis and candy shrimps with a few turbo snails and hermit crabs. roughly 15 kilos of live rock with some zooanthid growth. am interested an going in for some leather corals now. would i need a calcium reactor or just use supplements. any advice???









