Hey Neil,
I dont know if I agree with the small tank for baby snakes thing, I never have.
There must be alot of stressed out baby snakes in the wild.
I think that it should not matter what size the viv is as long as you have enough hides to provide the feeling of secourity for the snake. With a 55 gal tank for a baby snake I would have at least 6 hides. IMHO
I just know that when I get up in the middle of the night that all my Corns are all over their vivs. Babies and adults. So I am glad that I gave them the extra space.
IMHO, Jimmy C.