Maroons are notorious for being degreed interior designers. Mine is a major PITA. If I glue something in place, she almost immediately comes behind me to knock it off the rock. For their size, they are strong little monsters. Mine has moved 1-2 pound rocks around from one side of the tank to the other. She also attacks me if I get too close to her anemone. When I glue something in place, I keep my hand near it for a few more minutes to try to discourage her from knocking the newly glued coral off the rock. I can sometimes divert her attention with a pinch of flakes. Doesn't always work, but has been helpful lately. Try not to get too aggresive towards her, though, as she has a good memory and will increase aggression towards you (I've gotten a few thumps in when she really ticks me off and it takes a while for her to forget...).