i have left over golden king mealworms still from june 08, from some rescued leopard gecko girls (supposed to be true pair), that i tried them for but they didnt eat.
they actually are better composters than trying to raise earth worms or night crawlers, as i dont have to add water or anything, just dry compost into a pin and they seem to explode in numbers if just in some dirt with it too (i live in limited space apartment, and have them in compost on balcony garden, in trash can with four tiny holes for air/gas exchange in very centre top of lid). i just threw the frass out in compost with apparent eggs, as it was cleaned from my roach bins for compost. they get the water sometimes if i dont cover can from rain. they can actually do better it seems like that come to think, as they used to like crickets in vivariums to feed herps, breed and teem around heating elements and just eat cast off's of animals as well as any plant material. im trying t take thousands of beetles and raise them the best traditional way on oat meal/bran and carrots, but if they get the grain mite explosion again in summer, ill just dump them in compost, or roach bins more, or try to start one with just soil and carrots (potatoes seem to reek as their poop, and when switched back to last had traditional set up, is suddenly after a long while when the grain mites appeared again (dish soap layer around top rim will kill grain mites and keep them from getting in). when you get a ton of worms and are noticing a lot of dead/deformed not pupating out beetles, or tiny babies hatching, its because t\\you need to then put beetles and pupa in new bin, as med to large worms in big numbers like to start to taste and eat the eggs, pupa, and newly moulted adults, as space on top gets limited (also sign of mites, as all the larvae and adults will constantly stay piled on top of each other on top of grain). if you have a ton of meal worms out somewhere in a bin and have a dead animal they will be happy bugs, as they do love to eat them down to bones (ive tossed in a uneaten dead rodent, and dead birds as well as my dead roaches, and they explode in numbers even more, and if your odd like me, itll be fun to seemingly watch the carcass dance and crawl around till fully devoured from inside out).