Rosies actually thrive in tanks due to their arid environment, unlike most other boids. If you choose to house your rosy in a sweaterbox, make sure you have a lot of holes for ventilation... these guys need to be dry! <a href="http://www.ssnakess.com/forums/showthread.php?s=&threadid=20695">This thread</a> should answer a lot of your questions, as well as <a href="http://vpi.com/8VPICareSheets/Sandboas/RosyBoa/RosyBoaDesc.htm">this caresheet</a>. The one listed from rosyboa.com in the thread is relatively good, however ignore the remarks of heat rocks. It is a little outdated
I was working ona caresheet for Rosies or this site, however I lsot everything on my computer a while back so I will be starting over. Hopefully have it up soon enough though