Not as abnormal as you might think.....

As far as the fish damaging the coral....it is possible, depending on the species and temperment of the fish, and just time in general.....A maroon is commonly considered to be one of the most aggresive clownfish....If they are anything like any of my 3 pairs, then yes, over time, chances are they will injure/kill it, if not by physically abusing it, then by constantly kicking up sand and other debris into the coral.....

I recently moved all my corals, (except some GSP that was on one of the rocks) out of my maroon tanks and into my other tanks....

Best advice, just watch them.....if it gets too crazy, pull one of them out or place the anemone back near its old spot.....