I agree with slim, 15 qt is a good size the larger tubs are too big. I have some 200 gram balls in a 15 as well and they are very comfortable. It may not eat for a few days because it is a little stressed .As far as food goes, a good rule of thumb is to feed your animal a prey item as thick as your animals thickest point. Hope this helps. I was also at White Plains yesterday picking up a couple of goodies.....