Bi Colour angel

[outdoorworld_70]

I had a bi colour angel that just died. He was doing great eating well and today i noticed he was on a angel and hiding, I caught him and looked at him to notice he had like a wound on his body. Just wondering if anyone knows what this is.
Thanks

 

[Reefer07]

What other fish are in the tank? That looks like a wound from an attack or somtin. How long did you have this fish for?

 

[outdoorworld_70]

Theres triggers,porcupine puffer, emperor angel, few tangs and 3 batfish. I had him for around a week. I was thinking a rock fell on him because i found a small rock on the floor that was out of place

 

[Reefer07]

Maybe, but I could see the triggers or emperor picking on a small fish like that, especially being new. How big is the tank?