Tub Sizes?

[Jay_Bunny]

Are those volumes correct?

41 qt seems awfully small for a large female. That's just over 10 gallons. Keeping a large female in a 3'x18"x18" enclosure would be 40 gallons.

Granted, you don't need 18 inches of height, but even halving the height is over 20 gallons.

Yes, but that 18 inches of height that is unneeded adds to the size of a tank. A 41qt tub has more floor space than a 10g tank. A 10g tank is usually around 20" long, 10" wide, and 12" tall. A 41qt tub adds another 10 inches in length and provide much more space.