I use the Iris VE-175 tubs (xmas tree boxes) for all of my adults under 7 feet. they are only 12" tall without the lid and 14" with the lid. 20" wide and 52 or 54 inches long cant remember at the moment. they work well for the dwarf species and other young bci. Hog Islands are notorious for pushing in small tubs. however you can use deeper tubs and help eliminate that problem.