Okay well I'm probably going to adopt a triplet of rats next year from a rescue near me. I want to know all that I can before getting them (I do that with all pets) like how long do they normally live for? Is a 1 level FN good for 3? Is it better for a beginner to get a pair or triplet of females or males? Are the roll-about-balls bad for rats? Can you put bird toys in the cage as regular toys? Can you use fleece as bedding (i've seen it used before)? How big of a wheel should I use and what are the best ones out there for rats (eg. the most silent)? How much out of the cage time do they need? Uhmm....that's all I can think of so far, I'll post more if I have any other questions. Sorry about all the questions.