When they are smaller keep them in tub/rubs untill they are no big enough tubs to buy because there is no point buying different size vivs every year. I keep all my Burmese in tubs untill they outgrow them then i move them into 6ft or vivarium I have a 4 stack then If they need to be moved up again I have homemade 8ft vivariums that I house big females in but for the next 1-2 years. I wouldn't worry about vivarium size just yet make sure you buy a hatchling unless she is tiny you can start them of on large wieners keep him or her on them untill you think is sufficient and move up to smalls every 7-10 days your choice . But i would certainly go with a baby may be a albino green love the colours or if your only getting the one snake go for somthing abit better but don't buy a albino or a hypo buy somthing more exotic that you will take pleasure in looking at I can get you albino granite for £150 hypo albino labrinth het granite green for £200 look about the show for that special animal you will want to hold on to .
Sent from my SM-G925F using Tapatalk