I don't know why my one neon tetra is so much fatter, but it always has been. My guess is that it is a female, and the others must be males.
Seriously though, this is one FAT neon.
Next to another neon for a size comparison. Also, a photobombing endler.
Seriously though, this is one FAT neon.
Next to another neon for a size comparison. Also, a photobombing endler.