Question: how to tell the difference between male and female glofish tetra?
Answer: Observe the stripe color of the Glofish. Although each Glofish has a blue stripe running across the side of the body, each fish has a secondary color that determines the sex. Under the luminance of a light, if the Glofish has golden stripes, the sex is a male. If the secondary line is silver, the sex is a female.