[header] How to culture microworms [title] Find a microworm starter culture. [step] Because these worms don't lay eggs, you will need a few live adult microworms to start your culture. Remember that not all nematode species are a good food source, and some may even make your fish sick. 
[substeps] If your local fish store sells live food, check for microworms there. Try getting in touch with other local hobbyists through aquarist clubs.