Most likely they are "mini serpant stars" which I think are not babies of your full size stars, but rather are a seperate kind of brittle star that only get that big.
They are good guys, and very cool critters IMO. Abundant in most established reef tanks that I've seen. One of my favorite "hitchhickers".
(it's funny, there have been 3 seperate threads asking for ID on these exact stars in just a few days)
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