Danios can live from a few years to as many as ten. They usually stop breeding after about five years. They really eat anything but they relish their own newborn fry and baby brine shrimp. Sexing Males are more slender and sleek. Mature females are fat, especially when egg-laden.
Males tend to be smaller and more vibrant in color.
The males chase the females. Because danios eat all of the eggs and fry that they can reach, to get young, you must either remove the parents after spawning or collect the fry. I have collected the fry in two manners. One is during the weekly vacuuming of the tank. Large numbers of developing eggs can be sucked out of the bathtub to which I drain the tank.