Anemone sting on clown or something else?

slider162

Premium Member
I saw these dark spots on them once before and they went away the next day. They have been venturing out from the corner of the tank more and more lately. The anemone is on the opposite end.

Clown-Sting-014.jpg


If it is just a sting, is it something that they will build up an immunity to?
 
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