i have concrete mixing tubs so i dont have a tub chewing problem. i have wheels, corn, chewing blocks, and a hide in the asf tub but they still chew up the food the most. I even have 1/8 hadware cloth that i made some hoppers for them out of. every time i clean an asf bin theres always a layer of dusted food on the bottom of the tub. i tried waiting longer between giving food but they wont eat the dusted food. They just chew everything else and lose a ton of weight.