Is it under a rock? Might not e getting the light it needs? How long have you had it?
We have had it for 2 months now and our water is testing fine. Yes it's under a rock, after turning on the light it looks fin after an hour.
What are your water parameters? What lights are you running over your tank? How long has the tank been set up?
I'm not sure about the lights, and what do you mean about water parameters? My water tested fine and the tank has been setup for 3 years, but 2 months ago we moved the tank, at first some fish we're stressed but they all are doing fine it's just the anemone who is having problems