aptasia when it popped up in my tank got toasted, MUAHAHAHAHA no seriously though i either took a mini butane torch to it if i could get the rock out or boiling water and a syringe if i couldn't but i wasnt gentle and have only seen one since the first couple monthes i've had my tank when i went on my evil rampage
oh and now he's also toast... literally, although if you wanna be on the safe side i'd suggest quarentine over drying or boiling just to keep from having to reseed the rock which can take over a month