I bought a brackish water stone fish a few months ago and he has been a pig. He literally ate his only other tank mate within 10seconds of being put in the tank. He is feed shrimp and tilapia with some live goldfish as treats. For the past 6 days he just refuses to eat anything at all. He won't even take life food. I'm very expierienced with brackish fish but I don't understand why he won't eat. He is in 73degree water with a 1.014 specific gravity with normal water parameters. Any help on getting him to eat or diet advice for the future is greatly appreciated.