my tank has running about 6 months and I have had the anemone for about 3months and now it won't eat and stays closed a lot and when it is open it's not fully open have checked the water and everthing ( nitrates 0,nitries 0,ammonia 0,ph 8.2 ,salinaty 1.21)is good, I have t5's for light's, I have been feeding it shrimp form the store cut very small pieices , at night when the lights are out I look in the tank with a light and it is opened a lot more but can't get it to eat I tryed to feed it and it just pushes it out what should I do