I started with 50 mealworms from the fish store several months ago and just now have a new generation of mealworms large enough to sift out of the bran meal. There are only about 15 beetles left so I gave them to the chickens and they appeared to be a tasty snack. I started with just a few mealworms to see how it would go and now have hundreds, at least. So the growth from now should be exponential but it's a slow start. The worms are TINY when they hatch. I need to find something better to sift them with - the two sieves I have either let the worms fall through or they hold both the worms and the junk I want to get out. Next time I think I'll wait until the worms are bigger before I sift. I suppose sifting when they are all pupae would work IF none had become beetles and already laid eggs.