my pair i have that has countless of frys, i grew from my ex pair i had. so my pair i hav now is over a year old i think and the male is 3 inches just about and female 2.5 inchces almost 3. my female has a yellow color to her tail so im going to see if her frys will carry that gene. my ex pair, female had yellow in her tail and passed it down to my pair i have now, so maybe she will pass it to her kids, if she does then theres 2 easy ways to sexs cons i have now as my males dont have the yellow in there tail