I woke up this morning to one of my clowns acting funny. He was laying on the bottom of the tank breathing heavy. Well, when he saw me he flipped out, insane style!!!! Swam in circles banging his head on rocks. When i went home at lunch, he was dead. My other clown ended up in the sump somehow. This morning he was fine. When i went to pull him out of the sump, he fipped out like the other one and got sucked into the return pump. I couldnt find my blue tang anywhere, but when i was leaving she poked her head out and ducked behind the rocks again. Snails are fine, and i pulled a dead serpent star. Amonia tested .2. Nitrates 0. I am worried, snails and hermits seem fine, and the brain coral shows no signs of problems. Can someone help? Could it be a disease? Water temp fluctuation? Please someone help.