I just received a new shipment of fish and was really looking forward to getting a couple of Demasoni. Anyway, when they arrived 1 was really beaten up and has spent the day either swimming with his head down in a vertical posiotion or avoiding his tankmates. When he doesn't swim with his head down, he appears to float towards the surface. I saw him once appear to try to wedge himself between the rocks to keep from floating up. What should I do? The coloration of this fish is beautiful. Would hate to loose him.