I am still getting worms from the old bin and transferring them to the new one. the main difference in the new bin is the air holes. In the first bin, I used a ice pick to burn hole in the lid and side. After seeing the size of the baby worms crawling around, it makes me think they could go right through the holes I burned. On the new bin, I am using a very fine screen that I don't think they can get through. I am still feeding and "watering" the first bin and am finding more worms every week that I am putting in the new one. I am feeding them lettuce and potato peelings right now.