What's the problem when a ray tries to eat but isn't swallowing the food? The water was changed 50% recently so the water quality shouldn't be the issue. It just puts the food in the mouth and tries to swallow/chew back and forth, and gives up in the end with a chewed up food in the tank. It's got new tankmates recently, small dats and a small ATF. It seems they leave each other along. Some salt was added last week as stress reliver.
How to fix this problem?
How to fix this problem?