White brittle star or something else?

chiqui bb

Reefing newb
I have several very tiny, white things on my LR that hide in the holes. I usually only see the legs sticking out. The legs are smooth and white and look like spaghetti but very thin (about the diameter of a piece of thread). Yesterday I saw one completely out on the rock and the body is round but had only four legs. I googled pics of brittle stars and the body shape is the same but the legs are completely smooth. What are these?!
 
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