These are my three microworm cultures. I have had them since October. They are growing in a medium of Quaker Old Fashioned Oats. Cook the oats and let them cool completely and add your starter culture. What you see on the underside of the lids is an overpopulation of the Microworms. I keep these and my Grindal worms in a closet as no worm likes light. About once a month I scoop out half the culture and replace with fresh cooked and cooled oats. I stir them in thoroughly. If you don't do this the culture will crash and you will have a stinky mess that will draw the ire of "She Who Must Be Obeyed". Another thing I do is stir up the culture once a week. This helps eliminate anaerobic pockets in the culture and keeps production up. Microworms are easy to culture and maintain. They are the perfect first fry food. Live food that moves triggers a frys strike response that ensures that they are eating. Give them a try. You'll be glad you did.