She probably caught him in the anenome with a Tang. Send him off to spend some time with Tiger and Arnold.

Hmm, makes me wonder if there will be issues when I do the planned upgrade to larger tank and move my Maroon pair. They've been spawning quite regularly for more than a year, but have apparently taken some time off from that activity. 3 weeks now since the last spawn. I suspect it may have something to do with the fact that I made a mess of trying to remove one of the BTA clones from the cluster they are hosting in. At least Mama isn't beating up the little guy, they still get along. I actually have a copy of the Clownfishes book by Joyce Wilkerson, I'll have to take some time to leaf through it again. Best of luck with your situation, I think the advice so far about a trial separation is a good bet.