you can get rid of it with Lysmata wurdemanni / or RED SEA AIPTASIA-X 60ml or remove the rock from the tank and put it in very hot water . hot water will kill the aiptasia
Looks like Majano to me but it's still a pest. We had a tank years ago with a few Aiptasia / Majano on several rocks that multiplied into hundreds that we ended up shutting down and reset everything.