I have a worm tower with trays and my older tray is mostly castings very few bedding left. I added another tray and added food to the new tray thinking the worms would migrate up. Most of them have migrated up to feed which is great but it seems like there are still a good number of worms in the older tray. It is mostly castings and quite moist and i think they may be breeding there. I have only seen one cocoon but ive seen many juvenile worms when i fluff it up. My question is do i leave that tray alone and the worms will just all migrate up when they are done breeding? I fluff it once a week to keep it aerated. I have stopped adding any food to this tray because i want to collect the castings but the worms wont leave it. Any advice is welcome and thank you!