I would certainly go with the T-8 with the pop-in/pop-out divider. You can divide the enclosure 50/50, 70/30, 80/20 and so on until they're full grown. Call Animal Plastics about RHPs or shoot them an email. They can tell you which ones they prefer and once ordered, they can be directly shipped to Animal Plastics and they will get them tapped for you. Just my own suggestion.