Clown fish with open mouth!

[mrhasan]

Hello,

I have two o. clowns in my 20long. Just few days back, I noticed that one of my clown has his mouth open and breathing heavily (opening and closing, but not fully, the mouth rapidly). I can't seem to notice any sort of ich/infection near the gill. My water parameters are at 0 (amo, nitri, nitra) and I feed them spectra flake. I went through several forum and found that it might be an issue of jaw hyper-extension and people suggest an minor adjustment to the fish through anesthesia (which I am not comfortable with).

So did anyone experience this? What should I do? Should I just let it heal by itself?