glass anemone ?

that looks like a curlycue anemone to me. If it's a glass anemone (Aptasia) it's one of the fattest and most opaque ones I've ever seen. Aptasia typically have narrow, translucent columns. In low light they become transparent like glass, hence the name. Some people consider curlycues a pest but I've seen some cool photos of them pairing up with certain species of shrimp and crabs. They are usually embedded in sand with just the tentacles showing, so it's hard to say what that one is for sure.
 
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