I find it so hard to count them I am guessing 70-80, the best method I found is to take a picture then count them in the picture. I have 50 + or – in one tank 20 in another and approx 10 of really small fry. Mine seem to have gotten into a cycle of only one female carrying eggs every week at first they all bred every week, now 3-6 fry a week. This makes it harder to collect them they get eaten easier this way. If I had to guess the females have eggs when they mature I added the females just as they reached maturity so they all had eggs. Once most of these fry are sold I am planning to separate the females then reintroduce them to see if I can get another large hatch. Do your youngsters sort of stay near the surface? What do you feed them?