Zoas closing up, could this be from nipping by Pygmy Yellowtail Angel

[mako0321]

Seems like my zoas are closing up for no apparent reasons, im wondering if i should get rid of this fish.

 

[Jaycen B.]

I hate dwarf angels, everyone I have tried ended up nipping on something. I am done with them. My last was a rusty he was fine for a couple of months and then all the sudden nipping at everything. Have you seen him nipping?