I keep rosies in a rack in a basement reptile room. I run a dehumidifier during the summer to keep ambient humidity below about 55%, ideally 50%. I use only a very small water bowl (about 3 oz, I think), and don't keep water in them always. Normal venting in the tubs.
I haven't measured humidity in the tubs, but since relative humidity is lower at higher temps, the humidity in the tubs may well be lower than ambient.
I use 28 qt tubs and they work fine. If a person had a monster size female coastal, a V-70 size tub might be a nice upgrade, but not necessary for most rosies.
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