Can't remember where we learned this or how it even started, but we have had great success keeping our wax worms in a plastic bin with about 1" of oatmeal. We find that we can make it through a bin of 500 or so with very few if any deaths. We do this with butter worms as well. But for what ever reason, it didn't work with Phoenix's worms. From what I understand there natural food is honeycombs, honey, bee pollen, bees wax. Also your not suppose to refrigerate them, if you keep them at around 65 degrees they don't grow as fast and will last longer, kept around 75-85 they will grow fairly fast in their cycle, but hey, what Cham doesn't like a good fat wax worm?