I have some Xenia that I got on a clump of live rock that has started taking over my tank. I'm not terribly fond of it, I'm worried that it's going to start strangling some other corals and would rather use the space for something else anyway; what's the best way to kill it? I've been putting Joes Juice (kalkwasser) on it and it makes it unhappy for a bit but it seems to bounce back in a few days. Any other suggestions?