When I had ASF in my ARS rat breeder bins it didn't work so well, I think the food hoppers on top were a bit too high for them. I actually used a couple 6 inch pieces of 2x4 lumber with a rubber band to hold them together, it gave them a step up to the food and I used another one for the water. I finally put them in ARS mouse bins that worked much better because the bins were not as deep. My wooden blocks would get solid after awhile so I started wrapping them in newspaper which worked pretty good until I got my mouse rack. If the food is too high above the ASF they won't get to it as well as rats and mice. My baby mice will jump up and hang from the mesh above and eat upside down, the ASF won't do that. For my ASF I always but a few Mazuri blocks directly in the tub for the little ones so they could eat until they were tall enough to get to the food above.