As you can see from the above posts, there is no single answer. I'm going to add a little more mud to this discussion and say that females up to 2000 grams will do well in a 32 qt tub.
However, if you're building or buying a new rack, it probably wouldn't hurt to just go ahead and build or buy the rack with the 41 qt tubs.
I think someone sells dividers for the 41 qt, so if you need to, you can devide the tub into 2 for your smaller sub adults.
Good Luck!
Jim Smith
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