wild caught scarlet kings are not good for begginers for the fact that they are hard to switch over to mice and mainly dine on lizards. a rainbvow boa would not be a good choice for a begginner, one they need high humidity, get around 6 feet just skinny, and with 130 you wont be abe to buy one, they are around 200-300 here on the panhandle anyways. a 20 long is too small for a rainbow boa. a 20 long is perfect for a sand boa or rosy boa though. do some research and find out care info. with a 20 long you can get a cal king and they are really pretty i have an albino that i will never part with.