Sounds great!!
Forgot to comment on this:
You could move him to a larger tank any time. As long as he has options of nice, tight-fitting hides and a range of temperatures, he'll be just fine.
36x12x12 is what I've kept my honduran milksnake, Magma, in since I bought him a 4 months of age, and he's never had a problem!
Forgot to comment on this:
Also, at what size should I be thinking of moving him into a larger viv, I am thinking 36 x 12 x 12?
You could move him to a larger tank any time. As long as he has options of nice, tight-fitting hides and a range of temperatures, he'll be just fine.
36x12x12 is what I've kept my honduran milksnake, Magma, in since I bought him a 4 months of age, and he's never had a problem!