Sorry he sounds in a bad way, can you issolate him, how long has the jaw been like that, did he go thin before the jaw happened.
I would get him out of he tank,
1. clamped fins.
2. going thin
3. jaw deformatity.
As it pointing to fish tb, best to be safe.
This is taken off the board.
Tuberculosis
A fairly infectious bacterial disease, tubercolosis is becoming incresingly common. Affected specimens must be removed from the aquariym immediately so that other fishes aren't infected. A tubercular fish usually feeds normally, but loses weight as it's internal organs become damaged. Some fish develop nodules under the skin which eventually ulcerate, in other nodules develop behind the eye, causing "pop-eye".
The bacteria that causes the disease prefers cooler temperatures than most bacteria that infect humans. However, fish tuberculosis can affect people, usually in the for of an infected nodule on the skin, but there is a small chance that it will cause a serious internal infection. nce diagnosed in one of your fish, strict hygienic precautions should be observed. A definate diagnosis is only possible by a post mortem.
Things To Look Out For
Appears dull in colour
Weight loss
Folded fins
Ulcerous skin wounds
Treatment
Seek vetinary advice. Affected fish should be removed and euthanized. Don't allow them to die in the tank as other inhabitants will eat them and become infected too. The tubercular fish's contacts should be treated: move them to a separate hospital tank, and disinfect the original aquarium. If other fish succumb, don't introduce any new specimens, euthanize all affected fish then clean, disinfect and re-stock the aquarium.
