Where is the white spot? Is it that area to the top of the picture where it looks like a polyp might be closed?
Typically, any "disease" would usually affect a larger portion of the colony. It also spreads.
A lot of times if it's just a polyp or two, it can be from a pest like a Hydrozoa or some other critter constantly touching the polyp in question.
Can you get a better picture?
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Bill
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."
B.B.
Current Tank Info: "Still" Living vicariously through cb747
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