I think I'm not yogi is saying they don't seperate at all, the whole operation is in a single storage tub. Worms, pupae, beetles and all.
We leave everything in one tub but then maybe 2-4 times a year we strain the beetles out into a fresh tub, the biggest worms and pupae end up going with them also but we figure that just keeps up the beetle population. All the eggs and substrate and most sizes of worms end up in the old bucket for feeding. When we run out, we just strain again.
We started with 3000 and it took 4-6 months before we felt like we could pull worms out to feed to the chickens. It took about 1 month to get our first beetle and then the additional time was for laying eggs and the worms to be big enough to really see/use.
We started off separating everything out, but then beetles started escaping their 3" home. It was exciting to see the different stages at first, but escapee beetles...we just dumped everything into the storage tub!! Haha!! No more escapees.