I like to disinfect with f-10 and change bedding once a month maybe a little much but I would rather have a clean tub and health snakes than risk bacterial infections. It can get expensive but I use inexpensive bedding I buy from amazon the brand is called kaytee 8 cubic feet last a LONG time usually buy 16 cf at a time.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1