Spare tank, 1" or so of sand on the bottom, layer of equal parts oatmeal and bran, drop a couple of potatoes in, put a lid on. Add potatoes as needed and bran/oatmeal every 2-3wks. Voila, beetles. Continue to add potatoes and bran/oatmeal, continue to get more beetles. We also use ours as a substitute dermestid beetle colony on small things.






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