Are you feeding it? I feed mine once a week with a piece of raw prawn. Also have you changed your lighting? or the water flow at all. How often are you doing a water change? Since I have been doing a 2x weekly water change (due to diatoms) my anemone has never looked better. With the green hair algae on your rocks it may be that you need to do more regular water changes.... I am only a newbie but this is what I found helped for me when I nearly killed mine... I have had mine for 2 years now.