My coral had been doing well, when al of a sudden I noticed this thick slimy looking substance. I have forgotten the type of coral but I hope from the picture someone can tell me what it is an do two get rid of it. I have been fortunate overall with my tank, and hope this isn't the start of a problem. I do water changes every other week, my salinity is 1.024, temperature is 78.8, calcium around 400. I have been using Pohls extra every day, and feed zoo plankton and Roti feast each day. Your help would be appreciated.