Tomatoe Clown attacking my BTA..Help

[ncny21802]

I have a 3.5 inch Tomatoe Clown that was put in the tank after my small BTA. The BTA is about 3 inchs when fully opened. Just 10 ten minutes ago I noticed the clown bite at the BTA and turn his head real hard making the BTA fly around the tank. He won't leave him alone. He never hosted this anemone so what is the behavior about?

 

[ncny21802]

The clown flipped over my candy cane doral because the BTA was next to it. The BTA is now super small. I think I should bring this clown back to my LFS. I've had him for 1 week and he has been fine. Please help