I house the two adult females togeather they are fine, mind you they have a fairly big cage 2x2x4 and lots of sticks and cover. I think that a trio could be kept in that size cage as well (with a carfull eye for proplems) but gravid females would have to be removed. . I mist them 2 times a day but i have a humidifier going 24/7 ( not directly in the cage but in front of it to raise the humidity in the air, although id assume right in the cage would be much better), and i set up a driper every second dayish. Without this high humidity they have problems shedding and there colors are muted.
there is a pretty good care sheet
http://www.chamresearch.com/index.ph...id=6&Itemid=30
not very many info out there for rudis, but if you want to do more reasearch they are pretty much the same as bitaeniatus, ellioti, hoehnelii in there temps and requirements.
Brandy