That sounds like what I have. I didn't know what they were until I started to notice tiny red feather dusters sticking out. So if you have what I have then they are a type feather duster or something very similar to feather dusters.
they are harmless filter feeders. good in the sense they filter the water of small particles of food. bad in the sense they take food from the corals. depends on how you look at it . i will take all the filter feeders i can get though!
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