Croc skinks can be kept in pairs right? No more than that from what I read though?Croc skink can do well in a 3 feet tank. Just provide plenty of substrate for digging and shallow water for swimming.
For an arid setup, get a leopard gecko or fat tailed. I really love the oreo morph of fat tailed gecko, gonna get it one day myself. Or maybe an invertebrate arid setup, go for tiger beetles.
Can fat tailed or leopards be kept with more than 1?