Piece of advice: get the clown out first if he's hosting, otherwise you'll get pecked at the entire time.
As far as the nem, if its on a rock, see I he'll let you have the entire rock. If not, use nitrile or latex gloves and just nudge the foot and see if you can get it to release, it try blowing a powerhead at it for a bit and it will "probably" move and you can get it then.