One of the best ways to improve the growth rate of newborn fish is to give them ample supplies of healthy live foods. Microworms are a great choice for feeding small fry. These roundworms are a free-living (non-parasitic) nematode that is also known as the sour paste nematode. They are very easy to raise and feed to your newborns. However, they have two main drawbacks; one is that the culture medium begins to smell quite bad within a few weeks of creation. So, re-culture frequently and be sure to cover the culture.
The second drawback is that they are not aquatic creatures, so they sink into the substrate and die fairly quickly. As a result, it is best to feed these to your newborns in small amounts, and an even better method is to use a bare-bottomed tank where the leftovers can be vacuumed up before they degrade the water quality. Below you will find a great high definition video that illustrates how to raise these worms, as well as how to feed them to your baby fish. Enjoy. . .