You can keep smaller locality boas and smaller male BCI (common boas) in large tubs their whole life...I'm think the Iris "christmas tree" type tubs that are 4'x2'x18". I keep my boas in racks or tubs until they hit around 3.5', then I move them up to pvc cages that are at least 4'x2' in footprint.
I had my male BCA in a tub that was 3.5' x 18"x 18" from the time I got him (he was about 2.5' long) until he reached about 4'.. Then he got moved up to a pvc cage. While he was in the tub, I gave him a branch to climb on, which he used. My other male hypo BCI was housed in a CB70 rack tub until he hit about 3.5' and did fine in the rack, but I feel he would have used more height and climbing places if given the opportunity.
I'd say if you want to house in a short tub (at least until it gets larger) that will be fine, but plan on taking out the boa regularly to allow it to exercise.
About the STP, you may want to post on a STP group on FB or on a forum and get more opinions.. There are not a lot of STP keepers here, so you have a small pool of people to get opinions from.
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