Mona (2200g) has an XL Exo-terra cave, which is WAY too small for her... but she loves squeezing in there, and got really irritated when I tried to upgrade her. Nerissa (1900g) has a cardboard box right now, since I ruined her small litter pan hide. As for the sub-adults, they have either XL or large Exo-terra caves like Mona's.