I'm starting to see tissue recede away from the edges. I wanted to seek some help to try and save this expensive piece of coral. They are supposed to be very hardy, not picky about light or water flow. Sometimes I read that you should give them meety treats at night when they are open. But I never have b/c that doesn't sound like an easy care coral to me, and I put in phytoplankton quite regularly. Water quality is pretty good, but this coral should be hardy to even small problems, and it is a well established tank. I could take a picture but I think it's self-explanatory. TIA guys.