Danios are in a group of fish called "egg-scatterers". That means that the danios just fling their eggs around with no concern to where they land. Danios provide absolutly no parentel care for their eggs, in fact, it's very likely they'll eat them! If you want to breed them you'll need another tank (ten gallons work great!) with a bunch of plants either real or plastic and fine gravel. To condition the parents you feed them a ton of live food for a couple weeks . (I know their fat but this is how you do it.) Then you move the fish to the breeding tank and after the uncerimonius dumping of the eggs you should remove the parents to prevent egg-eating. Depending on the water the fry will hatch within a few days to a few weeks. After the fry hatch they need infintesimel food to start with such as green water, water set in the sun with some grass or leaves in it. There are a bunch of great books out ther that adress breeding so make sure to read. If you take good care of the fry they should grow nicely. There, that enough info? Lol!