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We recommend leaving the tub open, but if you must keep a lid on your superworm container (maybe due to interference by pets or small children) then make sure it's well-ventilated. The tub should be smooth so the worms can't crawl out. The container should be at least 200 square inches and at least 6-8 inches high. For example, you can use a bus pan, under bed storage bin, or wash basin.
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Many types of plastic containers can be turned into excellent superworm habitats.
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What's the best container for superworms? Add slices of fresh cucumber, melon, or potatoes for hydration. It is generally safer to rear worms at a lower density, as over-crowded worms can overheat, experience stunted growth, or become cannibalistic. The optimal worm-per-square-inch ratio will depend on the size of the worm and your experience in growing them. The tub should be at least 6" high, with a target density of 2-10 worms per square inch. Place a layer of 1-2 inches of bran, oats, wheat middlings, or crushed cheerios in a well-ventilated, smooth plastic tub.
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