Neon Tetra Problem

[Gillette1985]

Hey guys, ive recently set up my first tank. Today i purchased 5 neons and 1 male guppie to add as the first fish. After introducing the neons to the tank, watching them swim around i've noticed one of them has a problem to its mouth. It looks almost as if the mouth is stuck open, and part of it to one side looks missing.

Any ideas if this is something i should be concerned about and treatment needed? Or am i just worrying about nothing.

All help appreciated.

 

[Gillette1985]

anyone got any idea's? when i feed him, it looks like he takes in the small flakes and just spits them back out. There is no size difference between all the neons

 

[mattlee]

a picture might be of use to identify the issue

 

[mark4785]

It could be mouth rot as there is often an inability to close the mouth if a fish has this. If it is mouth rot the chances of survival are really slim as it can't consume it's food properly.

Please provide a picture of the mouth so that an accurate diagnosis can be suggested.