I fed the anemone some thawed mysis two days ago, and he's been closed up and hiding ever since, even with the lights on he hasn't come out. He's even more closed up than usual at night. I checked all my levels and everything seems fine ammonia is 0.25, but nitrate and nitrite are 0. KH is normal level. I'm thinking the shrimp has gone bad, and maybe made it sick. Anyone experienced this?