My Pincushion urchin is losing a lot of spines. Parameters are on point, and he has plenty of GHA and byropsis to consume. I got him about 5 months ago from the lfs. Acclimated fine, and until recently I began to notice the spine problem. My biggest concern is that 2 weeks ago my heater broke down and the temp dropped to 69 F for 2 days until I got a new one. Temp is 77F now, and has been since. I placed him on a sheet of nori a couple days ago, didnt eat much. Hes moving around the tank a ton, and his tentacles are going crazy. Hasnt been losing many spines for a few days, and has actually regrown a few black ones (or they turned black I dont know). What should I do?