My female mojave (700g) is in a 41-qt. I've actually put a couple in 41-qts that were as small as 200g, but that's just because it's the rack I have. I know I'm lucky that everyone eats like clockwork (every 5-7 days, depending on size) - I think my situation has been the exception rather than the rule. I expect to downgrade a few smaller ones to 32-qts. when I get another rack, but no problems so far. Everyone under 1500g has one or two hides, also (two for girls under 900g), just because there is so much room in the 41qts.