If it's snout was smashed into cubic-shaped, there's no way it could be healed completely. That means it smashed itself real hard its front jaws were mishaped. I lost one jumpy GATF of mine who's 14" and been this way since it was 4" like a week ago.
To prevent it, is having only one ATF with non-aggressive dithers like Tinfoil Barb I think. Also, you may use decorations that won't caused damage to it as an alarm. I have a wavemaker on one side and oxygen stone on the other. The tank was blacked 3 sided also.