Duncan coral black spot

[Jason boles]

Not sure what this is on my Duncan. It has been extremely happy and open where placed and gets to catch a bite when I feed the fish twice a day.

Went from 1 extra polyp to three in the 2 weeks I have had it.

This happened overnight (during the day)

Any advice on what I should do? I fear I can only watch it. If it was grown out more I may drag the head off but I don’t think that’s possible.

 

[AndresFL]

Same thing just started happening to mine. Need help