Angel problem

Hi guys I have a problem with one of my angels.(male)

It started about 2 week ago, the angel started by staying on the bottom and rarely swam only when I was feeding, then he started to turn on his side and their he would stay, he will swim up to the top when it's feeding time and take 1 or 2 pellets and go down again.

Just to clear things up he was in a fight about a month ago with another male where he's bottom jaw was ripped off but that has healed nicely.

He is in Qt but stil no changes.