Breeding Bettas
Eggs and fry: The eggs will hatch in 2 days. At first the male will collect the babies and return them to the bubble nest, this is normal. Once you see that the babes are able to swim in a normal fashion, remove the male. Now is the time to start feeding the babies. Feed them newly hatched brine shrimp, micro worms or vinegar eels. Feed several times a day for the first week to 10 days. At that time you can start adding some powdered flake food to their diet and begin increasing the water level in the tank.
Care: The babies need very clean water. Do a 50% or more water change every day and be sure to remove any uneaten food or dead babies that you see. Keeping the water clean and changed very often is one of the major keys to success. Be sure you cull the brood. Culling is to remove unwanted fish. Remove any deformed fish right away and destroy them.
Rearing and selection: Eventually you will need to split the batch as they will over crowd the 10 gallon. Removing the females to another tank is the best way. The males can stay together without a problem. Continue to feed quality foods of increasing size working your way up to frozen or adult brine shrimp and continue to do large daily water changes. Once they begin to develop color, you should cull based on color. Keep the color you like and remove the rest. Even if you started with two reds you will get a few that are not red or are not evenly colored. If they are near adult size a shop should buy them from you or at least give you some store credit. Be ruthless, keep only the very best to breed with next time around.