clown fish seem to be nibbling on my new mushrooms

Hi All,

I recently went out and bought some very attractive mushrooms - white
with filaments - so almost look hairy when extended.....this afternoon I
found one of them on the substrate....I watched the tank quite closely
after that and on of my clown fish is poking away at another
polyp....and looks as if she/he is about to send that one adrift as
well....now as I understand it, Clowns should be coral/reef friendly so
does anyone have any ideas what might be going on? (the tank is not
suitable for an anenome so I don't have one) Also what should I do with
the polyp sent adrift or is it a gonner?

Gill