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a good way to sift out the young is to punch a hole in the lid of a jar, that corresponds to the size roach you want, and place that in the colony with a bit of food.
If they're climbers you need to put a smear of vaseline across the top, witch tends to make things much messier, but still doable
If they're climbers you need to put a smear of vaseline across the top, witch tends to make things much messier, but still doable
