swords3711

I have recently purchased two glowlights for my 35g. They both have a strange bronze coloration in the middle of their backs rather than the tannish color. I have another that doesn't have it. What is this?

Dino

Different species of closely related fish.
Probably collected in different rivers.
There are many species of tetras that look very similar, that are lumped under a common name, such as glowlight, when they are sold.