I found to keep sps stability is the key, don't have large temp, pH swings. If you have a mixed tank be sure you have a good system (resin of some sort) to remove the chemical byproducts of your corals. Corals fight for real estate in the wild, that GSP doesnt care if you paid $200 for that frag it wants the space so figure out if the corals you have in there might be a problem. Be sure and have a steady and stable way to deliver your calcium and alk, I found I get better growth and health by keeping that part as stable as possible. if you notice that the tissue continues to die off, frag it and try to save it. Throw out the dying part of it so you can try to contain it because sometimes it will spread (not always the case but sometime better to be safe then sorry.) And the best thing you can do, have a tank that has been set up for a least a Year!!!!. I found there is nothing easier to keep then a tank that has been set up for a year and is getting regular water changes.
