I have a sick yellow Hawaiian tang that I've been trying to cure for the past 4 days. He was getting better until yesterday when I got back home and he was laying on sun coral without movement. I touched him thinking he was dead. He woke up but his tail was stiff. He found a safe harbor between glass and rock. This morning he is not moving at all, his side and tail (part thst was on sun coral) is turning brown, but I see that he is alive as his gills are still moving. Anything you can recommend to relieve paralyzing effect of sun coral?