My fountain feather duster won't stop twitching out of the spots I put him in. He always ends up on the sand bed. I have many feather dusters, all of which are in perfect location on the live rock doing very well. Except this guy ( Maroon and gold ) I never see him twitch on his own it always when I'm not looking. Is he destined to be a bottom dweller or could i glue him in place without regret?