Squarespot Anthias- somethings wrong?

[MichaelReefer]

I noticed earlier my anthias was acting odd. Kinda swimming towards the top right of the tank, swimming slow with a slight lean. I came home from Father's day Dinner and he seems to be breathing hard. He doesn't have any issues and everyone else in the tank is fine. I fed the tank and he didn't budge. He's plump and healthy (generally). He's the largest fish in my tank so I don't really see aggression being a problem. Anyone have some ideas? I've had him around eight months. No new livestock in the tank.

 

[MichaelReefer]

Bump!

 

[MichaelReefer]

Well nevermind. He just passed....i examined the body and there was nothing. No spots, wounds, anything. Maybe a random death?