sorry hear, i have been keeping my eye on this thread.
its amazing how they are all different. i had an anemone given to me and didn't know anything about them. he too went for a walk and got stuck in my powerhead and chewed into 3 bits, once i got the 3 bits out i threw them back in the tank and they are going strong, they are now BIG too, all 3 are bigger than the original piece, also bought a orange tip bta and never had it move from where i placed it, dumped it on a rock in front of the mp40 power head and its never moved, only grown. all 4 nems never move. amazing how some wont sit still but others wont move at all.
defiantly get another one! you have too :)