Personally, I wouldn't keep any type of true boa in an aquarium style tank. It just doesn't do it for the humidity they need unless you put ugly foil or something on the top. What I do is keep them in a sterilite container when they're young ($10) then upgrade them to a 4x2 PVC cage when they get big enough for it ($200) I believe that's an adequate amount of space for an adult bolivian, and it makes a beautiful display as well.