Had a Yellow Coris for over 4 years. Never one time did it ever 'adjust' anything in my tank.
But, it had lots to pick at, so your mileage may vary.
Back then I had acans, zoas, palys, gorgs, gsp, zenia, you name it.
Then in the next tank I had mostly SPS.
'Junior' ate all my amphipods then, after finishing off the micro brittle stars he could find, he moved on to pods on the rockwork.
But never did he tip over any rocks on the sandbed nor try to upset any freshly glued frags.
Had him up until he was 4" and would have kept him longer if I could - sadly he passed.
Good luck !!