Microworms are a tiny nematode about 0.5 to 2.0 mm in length and 0.05 mm in diameter. When cultured under the right conditions they will multiply in vast numbers. Microworms like it warm and a temperature range of between 25 and 28° Celsius is about right. Although they will tolerate cooler and warmer temperatures, they will not increase in numbers as well. I have been culturing microworms for many years and over this period I have tried several different culture mediums. Bread soaked in beer, yeast blends, and a host of other foods. There are almost as many different culture methods for microworms as there are aquarists, each having their own successful anecdote. I will outline some of the more successful methods I have used. What you have to do is find one that suits your particular needs.