Ive been reading every post I can about keeping my new little piggies healthy. Do I need to treat them for mites etc, or just if they get them? Also should I use the fly strike spay? Treating for fungal infection at moment, but just trying to keep one step ahead! Also vet advised not to use sawdust, I used to keep pet rats and it was bad for their breathing, is this same with guinea pigs? Sorry so many questions.