Ammonia is terrible for anything in living in the tank but the bacteria. Buy some Prime and dose what the label says. Also as others have said, the anemone doesn't need to eat every day. I feed mine once or twice a month. This is my first nem, and I got it a month into my cycle being completed, (way to early... I know), but now I'm at the 6 month mark and it's still as happy as it's always been. Get your salinity up, ammonia down, give the nem 10+/- hours of light per day, and let it be. They inflate and deflate, (BTAs), for various reasons- water intake, water purge, stress, poop etc etc. Just let it go