28qt is fine for adults under 2000 grams. Most adult males and some adult females can live comfortably in a 28 qt. It's just the big girls that usually need a 41 qt tub.
Here is my tub to weight ratio:
6 qt - hatchlings
15 qt - 500 grams and less
28/32 qt - 2000 grams and less
41 qt - 2000 grams and more
However, I have put animals smaller than 500 grams into a 28 qt fine.
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