The one silly questions are those left unasked. As to the size of the boa, 10-12 foot is pretty big for a red tail (depending on type and sex) I'm assuming since you didnt say otherwise you mean a common BCI so we will address those. For females 10'plus is possible but not always the rule, for males 7' is a little more likely as the females get larger. As for the enclosure, 4' will last a long time for your boa but probably not forever. 6' is a little better for an adult. Also make sure that your enclosure has depth as well don't build it 6' long x 18" deep. A pretty good adult size is 6' x 30" in my opinion. This may be a little snug if your female gets huge but should cover the majority of adult red tails. Hope this helps have fun and good luck!
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