Cowgirl, sad to say, most, if not all cages sold as guinea pig cages in pet stores are far too small for guinea pigs. The proper sized cage for Pucca would be one that has floor space no smaller than .7 square feet (or 76cm x 91cm). You should really get him a more appropriate sized cage. C&C cages are great, cheap and spacious enough for any guinea pig. You can find out all about them here:
http://www.guineapigcages.com/
As for keeping them in pairs, they do so much better when they have friends. They are so very social and not having another of their kind makes them kind of lonely.