I'd put my money on the Clarkii's, especially if they are starting to get comfy and mate. I had a Maroon that started to rut and would pick up HUGE LPS colonies (like literally break them off the rock) and drag them to the back corner of the tank because "they didn't suit the decor". I also watched it more than a few times tail-whip my SPS colonies and shatter them to pieces, then bury them in the sand. My second guess is the foxface.
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