today I've discovered hundreds of minute mealworms rumerging through the oats, I was so happy at the site of this

they were in the beetle container which I gave up on breeding months ago, what I noticed long before I found the little guys was that there was about four adult mealworms resting on the top. I think they have been breeding the whole time because the beetles wouldn't of survived for that long, there were mealworms of every size in there. I was wandering does everyone just leave the colony be and only 'harvest' the adult mealworms or just seperate the babies from the beetles if so how do you do this?
thankyou