I got my Tiger Barbs to depsit their eggs into a breeding cup, and I let them sit there to see if they would hatch out.. I have read that they shoul dhave hatched within 24 hours.. Not one of them did... Did I do something wrong?

guppy said:First time breeders? If so don't be suprised if none hatch. The first couple batches of eggs are often sterile for a lot of fish. Just to be sure we are talking about the same fish here is a pick. It is not one I have bred but this info comes from a commercial breeders hand book.
For optimal egg production use high protien conditioning foods like black worms and keep the tank ph neutral with a hardness of 100-250 ppm, temperature at 78 degrees F.
Use marbles or spawning brushes to keep the adults from eating the eggs, they often do. A partial water change using 6.5ph and 100ppm hardness water often triggers spawning in ripe females. The adults do not care for eggs or fry.
eggs normally take between 36-72 hours to hatch at 78 degrees F. they do best in a gentle current.