Aggressive mushrooms?

[sdbc]

I have a bunch of orange Yumas (50-60) in my 125 under 6 bulb T5 light. A few of them are not only at the top of the rocks in the brightest parts of the tank, they appear to be attacking some other corals (successfully, I might add). One has moved to the base of my Montipora and another has moved next to a Favites frag. They are some of my biggest ones, about 4" across. Has anyone heard of these being aggressive?

 

[eastlake]

I gave one, that went wandering from my colony, to a friend of mine and she told me that one morning she turned the tank light on and something had pushed the Yuma onto a rhodactis. It ate and or disintegrated half of the rhodactis. But I've never had a problem in my tank so perhaps its just a case by case basis.

 

[sdbc]

Thanks. I thought they didn't affect other corals, but they are clear winners in any battle. I'll just need to keep them separated in the future.