I'm pretty sure I've got a male and a female, so hopefully some of them will be fertilized, there's at least a hundred of them scattered all over the breeding tank. On the plants, on the filters, on the rocks, on the bottom of the tank. I also put a bit of...Ummm...Blue stuff in it to hopefully keep them from fungusing. I'm not sure what is in it, it doesn't have a list of the ingredients I just grabbed it because it says it's for treating fungus. I put in about 1/5th of a dose, it wanted 1 drop/liter and it's a 100 liter tank, was getting pretty blue after 20 drops so I stopped. I've also got a couple in tank filters blowing across the bottom of the tank where most of the eggs are to give them some circulation.