I was originally going to set up a plastic tub for a BP and get a young one, but I found someone rehoming a slightly older BP. She is being sold with all of her equipment, but lives in a glass aquarium with a screen top. The plastic tub I bought is 15 gallons, but her aquarium is 40. She's 3 feet long from what the guy said. I've read about a lot of people having trouble with keeping humidity up with a screen top setup, but I imagine downgrading from 40 gallons to 15 might feel a bit cramped for her. What do you think? Should I look for a bigger tub, or does anyone have some good ideas on how I can work with what she already has? I'm a first time BP owner, so I don't know any of the tips and tricks yet.