I think male colombian boas are about the most perfect large pet snake. Not to large when grown ( 6 to 7 ft.) and if raised from a juvenile and handled often are usually docile.
A boa will grow out of a 20 gallon tank at around a year to 18 months depending how it's fed.
If a docile boa is what you what I would recommend handling the snake before you purchase it. If there's some reptile shows in your area, thats a good place to see and handle them.
Good luck and I hope you find a good one.

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