baby anemone

A few weeks ago, my green BTA found his way to my Gyre pump and was pretty much totally shredded. My tank has recovered, and I didn't lose any fish or corals, but I am seeing some small polyps growing in the sand along the edge of a rock, that look for all the world like pictures I have seen of...

did a water change and found this. can anybody tell me what it is or what it might be an anemone. help me please!!! i had a long tent. anemone.