Our profile doesn't go into detail on spawning, so here is some info from my friend Matt Ford, a UK biologist, taken from his site:
Like many small cyprinids it's an egg-scattering spawner that shows no parental care. That is to say when the fish are in good condition they will spawn often and in a densely-planted, mature aquarium it's possible that small numbers of fry may start to appear without intervention.
However if you want to increase the yield of fry a slightly more controlled approach is required. The adult group can still be conditioned together but one or more smaller, say 12" x 8" x 8"/30cm x 20cm x 20cm/12.6 litre containers should also be set up and filled with aged water. Fill most of the available space with fine wool mops, Java moss or other fine-leaved plant. Neither lighting nor filtration is necessary although you can install a small air-powered sponge filter if you prefer.
When the adult fish are well-conditioned a single pair can then be introduced to each container; using more increases the risk of egg predation plus males tend to distract each other from the females if there's more than one in the tank. Spawning normally presents few problems with around 30 mildly adhesive eggs deposited in a typical event.
At this point the adults are best removed as they will eat any they find, plus females need a recovery period before spawning again as they're unable to produce eggs on a daily basis. In nature it apparently breeds year-round so you can always select another pair and work a rotation system if continuous production is the aim. Success has also been had using a permanent set-up with a single male and multiple females, the eggs being removed each day using a pipette or length of airline as a syphon. In this case ensure the water in the rearing container is the same as in the adults' tank. Incubation is temperature-dependant to an extent but usually takes around 72 hours with the young free-swimming 3-4 days later. Initial food should be Paramecium or a proprietary dry food of sufficiently small (5-50 micron diameter) grade, introducing Artemia nauplii, microworm, etc. once the fry are large enough to accept them.