Check this out. I have tried to get a pic, but the sweepers only come out at night and it is dificult to get any detail. I usually spot feed frozen food to get them to retract, sometimes I have to harass them back into their mouths with tongs. I have lost zoas, rics and a part of a monte frag to it.
Acan echinata care? - Nano-Reef.com Forums
Scroll to the bottom of the thread for pics.
This is what happened to one of my rics - 4" away against the current:
http://i712.photobucket.com/albums/w.../P10105151.jpg