well....i have 21 insect eaters and i have more mealies than i know what to do with...
i have a container with approx 200 beetles in a substrate of oatmeal, wheat germ, oat bran and other grains, spirulina flakes, fish flakes and alfalfa topped with collards or whatever is leftover from making beardie and iguana salad
about once a month i start a new colony by moving the beetles to a new container (while watching a movie since this is tedious work) and leave the eggs to hatch and new mealies to grow
i find they grow faster when you give them something moist to eat like carrots
you'll know they are getting bigger when you get the citin all over the top ... i vacuum this off or blow it into the tub
(sigh, sorry) so i recommend you keep the beetles in there for a few more weeks to do their thing
when the mealies have grown as big as they will get i also remove the pupae since i find the mealies nibble on them as do the beetles
hope i didn't totally bore you