I had great success with these. When they arrived I gently sucked them up with a turkey baster from the cup that they arrived in, and very gently placed a couple near some of the larger aiptasia I had. Within 10 minutes a couple of them were attacking and eating aiptasia. After a few weeks no aiptasia. After a couple months I did not see any Berghia anywhere, and thought they died off, but every now and again I will see one crawling on the glass. They have grown 3x in size.