I converted a 55 gallon freshwater to a saltwater. The tank has been saltwater since June of 2004 and has about 125 lbs of live rock and a thick live sand bed. The filters I had on there were the large and small empreor's. I also have a seaclone skimmer, a small canister filter with a pond uv sterilizer hooked up to it. I want to upgrade the equipment and put a sump or some kind of berlin system in. However I have no idea what to upgrade to. What is a good skimmer to add? What kind of sump system should I add? Should I add a calcium reactor? My lighting system is a compact current system with 4 stages of lighting including moon lights. WE are doing a community tank and our going to had coral's and anemoes. I just need some help on what is the best equipment to upgrade too. Thanks to all who help.