Something has happened in my tank. my two torch corals have both been losing heads lately. They were doing incredible and then what seemed like all of the sudden, the massive 10 head one lost three heads. the small one I got at the frag swap is gone. both heads. they just went up in a brown slimy mess. Not quite brown jelly like but similar. I fragged up the largest one to try and save what I could. all other Euphelia and SPS in the tank look amazing. frogspawns are massive. Derasa clam looks fantastic. zoanthids are happy. Salinty is spot on 35ppt. po4 is .10, nitrates were 5ppm. ph is good, alk was 158ppm. I havent checked the calcium but will tonight. im just at a loss here.