What could these be?

FjordReef

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My apologies if the answer is obvious, but I’ve not seen these before. They don’t seem to fit what I’ve read about hydroids. They have doubled in number in my 10 gallon over the past month, popping up in different locations around the tank. They behave almost as some sort of tiny tube worm or duster, retracting back into the rock if touched or disturbed. Sometimes the clowns will pick at them. Fully extended, they’re about 3-4mm in diameter.

Further apologies for the low quality photos!

279150BF-5596-4C3D-A1BD-540BA80A4F74.jpeg

DDDBC3E8-80B3-4D3E-B58B-64F597E2B0D3.jpeg
 

GoVols

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Have they made your cloves recede back from that area, where they are growing?
 

GoVols

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Are they clear-ish looking or do they look like a baby feather duster?
If their clear-ish = aiptasia

Don't think their baby Aiptasia or Majano but sure could be wrong.
 

Bepis

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Probably

I'm going to try and ask this with out sounding rude but I want to know because you have a LOT more experience than I do. Why would you think this is not Aiptasia?
(Is it because the centers are to big?)
The shape of center, and “arms” is totally off in terms of aiptasia, looks more along the lines of majano anemones, I would love to see a pic under a whiter spectrum to see the coloration. Only thing that bugs me is that these seem to be tiny in size which would probably mean there is a larger individual in the tank or in the system this rock came from. That is if this is majano. Of course I’m no expert and just my personal observation.
 

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