How do you tell the difference with a male black skirted tetra and a female? ?

Question

Ive searched everywhere and can't find anything that I can distinguish for myself.

Thx in advance for the help!

Answer 1

Differences can be noted in the size and the plumpness of the female.  Females have a more robust profile compared to males.  Females are also slightly bigger in size than males.  You can better see these differences if you can compare both sexes side-by-side.