For those of you that saw my other thread about a leak in my tank, this was an issue before the leak, which is now resolved. I've noticed that on this head of torch coral, which is in the process of splitting, there is an area of recession that is slowly getting bigger, probably over the course of the last 3 weeks or so. Its only on this one head. And the other side of this head, and all other heads, actually look pretty well. In fact, if I wasn't keeping an eye on this area of recession, you'd think I have a pretty healthy coral, it inflates pretty well during the day. Params have always been stable: 1.025, pH 8.1, Alk 4.5 meq, Ca 460, nitrates 0. I moved it to an area with less light for now and slightly lower flow. Not sure if there's much else to do, but wanted to see if anyone else has some advice.