I know a lot of guys who keep adult males in 28q tubs which measure 23" L x 16 1/4" W x 6" H, and their females in the 41 quart tubs which generally run about the same width and height but IIRC 35" long. I have 5 of mine currently in 28 quart tubs, 1 in a 6 quart tub, and the other 5 in 41 quart tubs.