It looks like one of my neon's mouth is stuck open...but it seems at feeding time he is able to close it and eat without any problems...any idea what the problem could be? He's behaving fine otherwise...it's been like this for a couple of days.
As long as there is no peculiar behavior ... I wouldn't worry about it. I had thought that he couldn't close it ... rarely but sometimes a piece of hard food will stick in the mouths of small fish... but that doesn't seem to be the case here.
