So I bought a very pretty green BTA over the weekend, but it's been walking around and looking decidedly unhappy. I keep noticing small nicks, cuts and abrasions on both the tentacles and column, usually with what look like a little bit of mesenterial filaments sticking out. I'm assuming these are from scraping against rocks, there isn't anything in the tank that could damage it (just two clowns, a cleaner shrimp and some hermits, none of which have seemed to notice it). The tank has pretty high flow. It inflates at times but mostly just lays partially limp upside down under a rock (not where I originally placed it, of course). I haven't checked my water parameters recently but everything else in the tank, including many SPS, are doing fine. Any ideas as to what is damaging it and what I can do?