Microworms are an excellent, easy-to-raise livefood for all manner of fish fry. They are very small worms which can be fed to any fish capable of eating newly hatched brineshrimp. Microworms are a potent food source which are cheaper and easier to do than brineshrimp.
Starter culture includes instructions to get your worms producing. If done properly, a starter culture will start outputing worms within a week.