White fuzz in polyp holes?

splix

New member
I got a few colonies in yesterday. While moving a couple around, I noticed this white fuzz (almost looks like cotton) on old colonies I've had that I never touched. It doesnt look like feeders, but they might be some kind of feeder that I've never seen before.
It's not just this one colony, it's 3 or 4. I've never seen them do this since I've had them.

Far right branch as well as center left.
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Top of the center branch
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