The Care Sheet on BP.net recommends using a 36x18x12 for an Adult Male or Female and that is a 30 gallon, so no 20 gallon isn't big enough for an Adult unless your Adult snake is very small. Iv seen people put there BP's in a 55 gallon tank and have no problems. If you just put a Water Dish and 2 hides in the cage, well then yes I could see the snake being stressed. But if you add additional stuff like Fake Plants, more then 2 hides...ect the snake wouldn't be.
I'm not trying to be rude or anything if thats what it seems like but if some one asks a specific question about tanks you should answer it in the same format he asked it. Instead of not mentioning a 10 gallon tank at all in the post you say some thing about a shoebox-sized tub. Thats fine though other recommendations are ok but at least answer the question about the tanks. Sorry if I came off rude in my posts I didn't mean to, its really hard to make judgments on how a person means some thing because you can't really hear the tone of voice.![]()