He seemed unconcerned, and was just hunting away. I ended up spritzing him with the spray bottle a few times which loosened it up some more and then as he was hunting I watching him kick the left over part off. It was weird, because I thought they pushed it off towards their mouths and ate it.... but maybe this was just a piece that was left on top and not the main part of it. Anyway, it looks to be gone now, but I will check again a little later to make sure.