Something is wrong with my Angel

[becka]

I have a black/white angel along with various other fish in my 75g. I just noticed he didn't come out tonight when I fed the tank, so I found him hiding inbetween the coral, looks to be breathing hard. Everyone else looks fine and the tank parameters are good. I don't know what I should do??? Thanks!!

 

[alyssia]

Please define "good" parameters. What are they?
How long have you had the fish? How old is the tank?