Ever see anything like this? Just started overnight a couple night ago. Still eats, but seems to be having more trouble hunting today. Only ate a few smaller pieces of mysis and seemed to struggle getting that down. Stomach looks too empty. Looks like he's been beaten up a little. Only fish in tank are an algae blenny and a royal gramma, a few snails and hermits too. Other two ponies look fine and are eating great. Any advice?