I have a pepp, and the little bugger always steals from my cynarina, my candy, my zoas, but never the bubble or frogspawn. They are programmed to be the ultimate scavengers. it still is frustrating. I feel ya all. Nonetheless, I believe 82 F to be to high. That is about as hot as any tropical water ever gets. I have my chiller on my 24 g set to 76 F. Temp could definitely contribute to unhappy corals. It causes bleaching for craps sake. As well, too much flow on the fspawn could have caused the inability to open. But it sounds like you have it under control. Frequent water checks are totally necessary in any tank. I am glad you got it figured out, and I am sure you learned a thing or two, which is what this all about anyway, right.
Congrats
STUPID BABBLING OF A REPLY. LOL