My friend has a friend of a friend that will be having some RTB babies soon and is giving them away. I always liked and wanted a bigger snake and when I got my ball python I was hoping he would grow a little bigger but he stopped at 3'.

The parents are 6' and 9' (female/male) and thats all I know about them. Is there a sex that tends to get larger than the other? A 6' RTB would be perfect and a 9' being the max I would ever want. How often do they get this large? What size do they normally get?

When my BP was a baby I held him quite a lot but sometimes recently I only handle him maybe once a week (sometimes once every 2 weeks) and he remains docile and mellow. Are RTB the same in this aspect?

Like BP I know there are morphs for RTB, but are there sub species that get larger than others, or ones that are more aggressive than others that I should watch out for?

How fast do they grow? How big will it be in approx 2 years? I have a 20gal and 40gal tank. I normally keep my BP in the 40gal tank so the 20gal would be perfect for the RTB while its small. I'll be in college for another 2 years and I'd like to be able to use what I currently have as I have no room for another cage. I was planning on getting a RTB when I was out of college so I didn't have to worry about space but this opportunity came about. I read a rule that you should have a tank 2/3 the length of the snake, is this true?