I think my Tang at the polyps on my birdsnest?

#1
My birdsnest is huge and was beautiful until I got home from work and 1/2 the polyps we gone. It looks like necrosis but nothing has changed in my tank and it was like an overnight thing. I then noticed my blue tang, that I have had for months and never seen him doing it nipping at the polyps. Until today it was full and looked hairy with green polys, today 1/2 are gone.... I'm confused
1.026 salinity
1400 mag.
480 calc
9.8dkh
No phos, nitites or nitates. Everything else is thriving.
 
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