Really need help. I have been searching, with no luck!, everywhere for an answer as to why our brown brittle starfish has just started to disintegrate. It started with a hole in its center. Not all the way through but just on top. Now he is just coming apart everywhere. Legs falling off and body looks almost like he is being eaten away. Main tank water checks out fine and I have moved him to a hospital tank with new water (also fine) and his own piece of live rock. He does not want to eat. This happened shortly after I added a flame scallop and goby. CAN I HELP HIM???