Anemone on my LR

[swissfish]

Hey guys has anybody a clue what this is?
It suddenly started growing on my LR.

 

[SaltwaterTeen]

Not anemone, it may be a blasto or an acan, but I highly doubt it. Maybe a shroom?

 

[SeriousDude5]

Looks like a shroom to me possibly a polyp I had a polyp on my rock once...the I got 50 more pounds and needed to rearrange never saw it again awfully sad story

 

[swissfish]

He is shrung up right now. During the day he is about 2" in diameter and when he gets a hold of a pellet he graps it with the litle tentacles and moves it to his mouth.
Cool thin to look at hope it is a beneficial thing