Yes, if they are neutered. Some people do this and the animals groom one another.
I prefer an already built cage over a custom cage as they do last longer. I got my last few cages guinea pig cages here http://www.petproductsbyroyal.com/rabbit-guinea-pig/
No its not, i guinea pigs cage is way bigger. & you should not have the same size of guinea pig cage as your hampster.
no
You may want to add extra bedding or a shelter for your guinea pig as they may just want to burrow. I got my last guinea pig cage here http://www.petproductsbyroyal.com/rabbit-guinea-pig/ and love it!
Lots of people say rabbits can be kept in the same cage as guinea pigs but it's very dangerous and should never happen. Even if your rabbit is friendly or just a bunny the guinea pig will get bullied. This will also lead to lack of the space and the guinea pig may be stepped on or crowded in the cage. Rabbits need a bigger cage, a bigger run and different medicine and vaccinations which affects the guinea pigs well being. If you are looking for a partner for your piggy try another lonely female or a neutered male. But guinea pigs should always be kept with another guinea pig and no rabbits!
I prefer already built cages over custom built ones as they tend to last longer. I got my guinea pig's cage here http://www.petproductsbyroyal.com/rabbit-guinea-pig/
Yes
The best way to clean a guinea pig cage is with water only. Using anything else may be harmful to your pet. If water alone doesn't work, then it is time to buy a new cage. I got my last cage here http://www.petproductsbyroyal.com/rabbit-guinea-pig/ and love it!
nothing really. my rabbit and guinea pig eat exactly the same things.
Actually rabbits an guinea pigs are fine together. But maybe the female guinea pig is felling lonely being the only kind in the cage. Or maybe its because the rabbit just doesn't like the guinea pig. If it's possible you can try getting another female guinea pig or separating the the guinea pig and rabbits.
It depends if the rabbit and guienea pig are both males or not.
No I would get a slightly smaller cage than a rabbit cage guinea pigs are a little bit smaller than rabbits so they don't needquite as much space. Also take into consideration that rabbits have paws and guinea pigs have instead very sensitive feet so it is not advisable to put a guinea pig in a cage designed for rabbits. This is because rabbit cages often have a wire bottom which makes cleaning a lot easier, however a wire bottom will definitely hurt the guinea pigs feet- sometimes to the point in which they have to see a vet for treatment.