I put this Eibli Angel in yesterday and it was doing fine yesterday evening (it was in fact the bully of the tank) but all day today, it’s been swimming frantically on one side of the tank like this. It just keeps going up and down along this side of the tank. It did eat a little earlier today but it didn't swim to the food, it just ate whatever floated near it. It was pecking at a Binac Anthias that was dying yesterday so I’m worried it got whatever killed the Anthias. Is this swimming behavior something to be worried about? Any suggestions would be appreciated. Thanks!