Baby Fish Aquarium
The baby fish should be left by themselves in their own tank for as long a period as possible, preferably until they are mature. If they are put into the community tank too early, they are liable either to be eaten by the other fish or else they will have a hard time competing with the older fish for food. After they are three or four weeks old, they should be transferred to a tank with rooted plants in it.
Baby fish should be fed finely powdered food. This food is prepared commercially and is very reasonable. As the fish get older, they can eat coarser foods. Daphnia and freshly hatched brine shrimp are also excellent foods for newborn fish.
If you are having difficulty breeding livebearers, there are several possible causes of trouble that should be checked. If you have bred too often from the same fish, she may stop producing for a while.
Sometimes the fish are undernourished. In this case, the best remedy is to feed them some live food and several varieties of dried food. Fine particles of chopped fresh meat (no fat!) are good. You should feed it to them a little at a time, because if you pour a large quantity into the tank all at once some may get hidden in the crevices and start to decay. Another cause of breeding interference could be stale water or water with an improper pH. Checks should be made on the pH as well as the temperature.
If all these causes are eliminated and the fish still fail to breed, then, in all probability, they are either too young to breed and may still need a few weeks to mature or are too old. Old fish may frequently be recognized by the hump on their back. Compare them to young fish and you will recognize this physical characteristic easily. As mentioned earlier, the average livebearer matures at about two to four months.
