My two male adult guinea pigs are fighting. They were getting along just fine until recently, I added Slyvester to the cage with Tommy and Jerry about a week ago. I've had to separate them because the bigger one (Tommy) was chasing and fighting with the smaller one (Jerry). I have them in two separate 2 x 5 single layer C&C cages in the same room. Tommy is still with the baby (Sylvester), and they don't seem to be fighting with each other. All the guinea pigs are in the same room. Is isolating Jerry from the other two going to make him feel lonely or is he still o.k. knowing he is not alone? Also will I be able to put them back together again or am I going to have to keep them separated?