Options:
(A). If you don't feed your fish live organisms, you may have to make a vegetarian or plant-based culture. Get your aquarium water and weather conditions in mind..
(B). If you can find a microworm starter culture, you can work out the right approach. A frozen batch of frozen worms is best, but you can also purchase an over-the-counter worm starter at your local pet store or online..
(C). If your local fish store sells live food, check for microworms there. Try getting in touch with other local hobbyists through aquarist clubs..
(D). Buy a fast moving microworm tank. The quicker you start getting to know the microworms, the easier it will be for them to grow..Choose from options above and answer: What most naturally follows?

How to culture microworms
Find a microworm starter culture.
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.
Answer:
(C).