Soft corals will occasionally close up or retract their polyps, causing the aquarists to automatically think something is wrong. Most soft corals will do this every couple of days, following that by sloughing off some of its skin. The coral is simply trying to remove dead tissue, parasites, and anything else that could potentially lead to health issues down the road. The retracted polyps and skin sloughing might last several days, so keep this in mind as well.
Tip of the Day – 9/19/20100