Can you help solve the mystery?!?!

[ucdpike2001]

I have blue faced angel. He has had some scale loss but not much. I assumed it was some what normal from the rock work. Then About 10 days later i found my blue face stuck under a rock missing his left fin. He has a 1/4 inch hole in him and is in bad shape and will most certainly die. What i want to know it whether it is a result of wasting disease or that he got stuck under the rock. All tank perameters are perfect and 15% water change every 2 weeks. Salfin tang, green chromis, common clown, sixline wrasse, cleaner shrimp, emerald crab are also in the tank. Can you help me determine what my blue faced died of?

 

[beaslbob]

If the angel was added after the tank, perhaps the tang harrassed it. At any rate it probably went under the rock because it was sick and needed protection.

 

[ucdpike2001]

Is it possible that the emerald crab may have attacked my blue face. I think he might be a little big for the crab. I figured if he went for any fish he'd go for the chromis.
???