I was told they are male and female not really sure how to tell though and I said that because me fishy said I sell my stock all the time and what I meant by it is i have fish I've had for years but I have stock that I always rotate but it's not like I sell everything in all my tanks and then start over lol that's all and from what I can tell due to coloring id say male and female but not 100% sure so don't hold me to it