D-maz, the fry will hatch on day 21 like clockwork. I usually see the female doing her booty shake dance and a day or two after the male has his cheeks full. If you catch that first day, mark it on the calender and count down. On day 21 I look at the male closely and when I can see the little babies eyes peeking out of his mouth it's time to get out the net and bowl of water. Oh yeah, and don't forget to fire up your baby brine shrimp hatchery on day 20. As soon as I put the babies in the 10 gal, they get thier first meal.