Got your message thanks
I have never seen them fight or show any aggression, but as you say they are probably too small at the moment I am guessing that he did it on the glass or a decoration.
Yeah there is a 4.5" red Oscar and a 3" JD in with him. Not sure how it happened as he was fine when I went to work and bad when I got home.
If you could send me some links Shroob that would be great
I came home from work last week to find my 5" tiger Oscar swimming round with his mouth stuck wide open and now 4/5 days later it is still open. He is still active and has a good appetite but just does not seem able to close his mouth. I have tried not feeding him for a day or so incase he had...