Like I said, water parameters are ideal. No ammonia, nitrite, or phosphates, nitrates fluctuate between 10 and 20, and calcium is rock solid at 400. pH has always been 8.3 plus or minus 0.1 and I keep salinity at 1.023.
In the store, it showed polyps. I got it home and it polyped out at night only. I had him higher in the tank than I should have, so I bumped him down a notch. He still polyped for a day or two and now he's just sucked in and I don't see him stick it out any more. It has made snotty sheds (very little) and otherwise shows no significant spotting or discoloration. It just shrunk and hasn't come out to play in a good many days now.