It looks like aiptasia to me, however there may be other anemones that look similar. When I had my aiptasia issue I put three peppermint shrimp in my 55 gal
tank and they were gone in a week. I don't think it would hurt to give it a shot. Worse case scenario you could move the shrimp to your refuge or give em back to your LFS
for store credit. Just my .02.