When to bump up tub size?

Messing around with my bigger enchi girl today, I got to wondering. At what size is a female too big for a 41qt sterilize tub? Right now the tub size is perfect as she is about 2200g empty at 2.5-3 years old and still eating a 150g rat each week. If she doesn't lay any eggs for me any time soon, I expect her to hit close to 3kg by spring since she's still gaining about 100g per month. If there's is a size they get too large for that size of tub, what do you move them up to?

Thanks,
Kyle


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