sand boas are a pretty easy lot to take care of,as opposed to a brb whom you have to maintain a high humidity percentage(80%) and they are pretty susceptable to overheating(i live in arizona)but other than that they are pretty much the same as any other snake as far as cleaning,you just have to make sure to keep the humidity up,i do this by usin fir bark and sphagnum moss as a substrate and i keep a big doggy bowl for water which helps the humidity all kinds,also make sure you let them thermoregulate if they need to,i have a hidebox with heat pad on one end and his water bowl with sphagnum underneath on the other end,male brazilians get from 4.5-5.5 feet,while females get 5-6.5,i hope this has helped you,rainbows are very beautiful snakes but make sure it's something you want to get.good luck!