I got a closer look at the fin, and it looks like I bite mark on the top. He looks like he is holding his own with the other fish, but there are a couple of bad asses in there. There is a large velvet damsel, a tomato clown and a small puffer, also a coris wrass. It might me that someone is picking on him. I was in the process of transitioning these guys into my new 135G. I think I'll keep the damsel and clown in the fuge for a little bit, and move the other two fish to the big tank. That way, this guy will be the only one in this tank, and he can heal better.