No boney skeleten though,closes right up to size of a pea when it's eating.Might be some form of blastomussa judging by the shape and configuration of the tenticle bases.
My first thought was plate coral also. I don't think plate coral anthocauli have a skeleton until they develop more. I could be wrong on that though. Nice score whatever it is.
It kind of looks like a baby hammer anemone? maybe not though doesn't look to much like a since there is no hard skeleton and the color pattern, could be wrong though.
Even small plates have a skeleton. If you poke it and you can't feel a skeleton it could be a majano. Poke it gently or wave water at it until it closes and take another close up shot of it. Hopefully it's a baby plate with awesome colors. Just keep an eye on it. One majano won't magically turn into 100 instantly. I think it's a plate but not sure. I have 2 baby plates currently. One was purchased on a zoa rock and one ended up on a zoa rock. I didn't know it was there until a few days ago.
99% sure it's a baby plate now. Awesome color. You can break it off that rock if you want and glue it down anywhere you want. Just cut at the very base where no flesh is, glue on skeleton, enjoy.
Its happy where it is don't risk it by moving it
Let it grow and mature. If it gets to largeits skeleton will pop off on its own and it may grow another from the stub that is left. Just enjoy it its gorgeous.
Just letting you know it can be done safely. Mine was surrounded in zoas so that's why I decided to move mine. Yours doesn't have that issue so no real reason to. And yes, at that size it'll keep growing fast. Nice find.