My bubbletip anemone does this sometimes, and mine is fine... It was very scarey the first time I saw this, but now I have more experience... My anemone sometimes also goes limp and loses the plumpness in its bubbles, and goes a dull brownish colour but it comes back to its nice white plumpness after a while. When I first got my anemone a few people on here told me it would die... and I was worried, but everything is fine with it and I am very happy I didn't take it back to the shop as was suggested. I am fairly new to saltwater aquarium keeping (7 months now) and the advice given can be from one extreme to the other, totally contradicting sometimes. it's a minefield!
Janet
janet