Flame Angel niping Leather

[acrylic300]

My flame angel has been good up untill recently when I put a new leather coral in the tank.
Will occasional niping kill this coral?
The leather lets off clouds when it is nipped is this harmful to the tank?
If I could get a clown fish to host something near the leather would the clown protect it from the Angel?

 

[acrylic51]

The clown would protect the leather if it hosted with it or in close proximity......Mine hosts in my Kenya tree which is about 15"-16" tall.....Flames are known to nip it's hit or miss, and yes will eventually lead to the dimise of the leather.......