I got home from work last night and was looking in my tank only to see my tang stuck to the power head. I grabbed a net and turned off the power heads to get him out and he swam away but I could see that he was really skinny and some flesh was missing from his fins. I got him out and put him in a 5 gallon bucket with a small heater and some leaf algae and hoped for the best but when I got up this morning he was laying side ways on the bottom not moving. I am not sure what happened ever thing else is doing fine. I check all my levels a couple days every thing looked good but my ph was a little lower then normal. I did a water change the same day to try and help with that. He was always picking at the rocks and glass so I dont think he was going hungry. He would even eat some of the brine shrimp I would put in there for the other fish.