Anemone Lose It's Sting??

[Madreefer]

So does an anemone lose it's sting. I've had a long tentacled one for at least 12 years. I walk by my tank and my lawnmower blenny is lounging in it and reaching over and munching the algae off of the glass. I thought he was a goner but he swam off and did his business elsewhere. He's been going back to it every so often. And no I don't overfeed my anemone as I have'nt fed it since I first got it. Weird