Maroon vs Duncan

I need some advice about my female gold bar Maroon. She host with everything but unfortunately not everything appreciates her love. I've tried anemones and I can't keep them alive in my little tank for stone reason. At the moment she is trying to host with Duncan and it's more then irritated with it I'm afraid if if don't find her a host she'll kill my coral. She is constantly knocking my frags over and rearranging things (reminds me of my Diamond goby I once had) what would cause this kind of behavior and is there anything other then an anemone she can host with and not kill?

I knew that was coming haha I've tried them in three tanks the eel tank been up and running for 2 yrs, the reef up and running for 8 yrs and my little 16 gl for only a few months. The 16 gl was set up with water, sand, and rock from already established tanks so it never cycled. The clowns are in the 16 gl

The one in the picture I believe is a female and she has a mate although in the past she has not allowed him to host with her. When there is an anemone in the tank she has always hosted with it within 24 hrs but they dye off within 2 weeks and she's back to my other corals in my tank. I have not tried that Mark Thanks for the link I will definitely be reading it. Is there anything at all that can handle her aggression?