I think a 40 breeder is too small for a BTS. They are big lizards, and unless you take it out for exercise daily, that seems awfully small.

I keep fire skinks, and think they are just stunning! A group would work well in a tank that size, and you could have fun with it. I have a pair in an enclosure about that size on organic potting soil. I am trying plants, but they keep uprooting them. Mine have bred, but I did not find the eggs in time. I think they are breeding again, though. These two eat out of my hand and surface frequently. They make really wonderful and beautiful pets.

I really don't know much about Schneider's skinks.