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Once the female has laid her eggs or given live birth, return both parents to their original tank, where they will quickly acclimate to their ordinary environmental conditions. This will protect the eggs from being interfered with long enough for the fry (newborn fish) to hatch. Keep the conditions in the tank the same. It can now be used as a nursery tank to rear the fry. With the exception of a few nurturing species, it's not uncommon for adult fish to devour their own eggs. If it's not possible to set up a different tank for the fry, add an abundance of plants and other physical structures to give them a place to hide once they're capable of swimming. Cover the tank on 3 sides with paper or scraps of fabric thick enough to block out most of the light from outside. Eggs and newly-hatched fish are often sensitive to lighttoo much may stunt their development or even kill them. As they continue to grow, their tolerance will increase and you can return the aquarium to its original light levels. Be sure to black out the sides that receive the most direct light exposure. Leave one of the larger sides uncovered for observation. You can even leave the tank completely covered with a sheet when you're not feeding or checking on the fry. . Get in the habit of emptying the tank by 25-50% and replacing it with fresh water at the same time each day. Clean water is a must while the fry are learning to breathe and filter on their own. Draw from the same source every time you refill the tank. It's important that the new water have the same basic composition as the old. When the fry first hatch, they come equipped with a large yellow egg sac that provides sustenance for a few days. Once this egg sac disappears, you'll need to begin feeding them yourself. Liquid egg yolks, crushed fish flakes, plankton and algae are all examples of foods used to nourish fry. Look for the foods and supplements you need at pet stores that sell specialty fish supplies. As always, do your homework to find out what foods are suitable for the fry of the species you've selected for breeding. Smaller species like tetras and rainbowfish, for example, won't be able to handle commercially prepared foods so soon after hatching, and need to be fed liquid infusoria or similar supplements that they can digest easily. As the fry grow larger, they can graduate to more substantial live foods like brine shrimp and microworms.
Remove the parent fish from the spawning tank. Limit the amount of light that enters the tank. Change the tank water daily Feed the young fish several times a day.