i hvae a new fish. it's some sort of halfbeak species (i haven't figured out which one exactly). it's about as thick as two thirds of a pencil, about 3 inches long and has a serious underbite issue. the lower half of its jaw doesn't move and the top half is actually less than half in length. only the top half moves when it's eating. it's in a tank with my black veil and platinum angels and seems to be doing quite well despite not being very mobile given it's shape.
here's what it looks like...
(am not sure if either one of the pics is exactly what i have but that's pretty much what it looks like)