I'm new to saltwater and just got a clown added to my tank about alittle over a week ago and he seemed fine until yesterday and he started acting like this yesterday he was swimming directly below the water line and then wouldn't eat, all tank parameters seem fine. Went out and got some PE mysis to feed it and ate just a few little peices today. But seems like it is stressed all of a sudden. Also seems like it's staring at the glass the whole time it's swimming, possible it might see it's reflection. Could it be lonely? It is the only fish in the tank at the moment and i know they like to be paired