Rosy Boa enclosure questions

[Pareeeee]

Ok I have been considering something, but not sure if it's feasible or not. I would like to get another snake in the future (possibly garter, possibly corn, not sure yet) BUT the problem is, I have no room for more enclosures in this little apartment except for a tub. My rosy is a 'boring' display snake, since you never see him out except at night or during breeding season, so there's no point in him being in the glass display tank he's in now. If I get a colubrid I would like to put it in the tank, since they move around a lot more.

SO my main question is: Would it be bad to move my Rosy Boa from his tank to a tub? I'm worried that a tub would create too much humidity. What do you guys do with low-humidity tubs? How do you keep them dry?

This is the tank he's in right now:


20 gal laid on its side for most surface area
Front grate to keep it nice and dry in there (Rosys require low humidity)
Warm side thermostat controlled heat mat @ 85deg
Cool side controlled by low-wattage light bulb instead of mat, (70-75deg) bulb helps keep tank dry.
Aspen substrate.
2 hides, leaves, fake plants, bits of driftwood


Thankee!