I dont think you have anything to worry about. It may appear that they are beating the crap out of the anemone, but they are probably just making sure they're covered. We were worried when we added a BTA and our clown, who was fairly large, looked like she was abusing it. She eventually settled down and finally let her mate in and he did the same thing. Now they are both happy. Heres a pic of the couple in their 1 bedroom anemone. They visit the smaller clone every so often, but this is theirs.