Please stop putting them together until you have a large enough cage, it's pretty much pointless. Even when I had just the 2 boys a 3x5 wasn't enough room for them to tolerate each other. If you put ramps in the cage that will take up floor space and negate the whole point of enlarging the cage. Some people have made it so the ramps don't touch the floor and the piggies can run under it. It would still have to be low enough for them to climb up on. Check out some of the cages people made with a loft area, they don't need a ramp. Once you do have them all together in a large cage they will still chatter at each other off and on because as we all know living with someone 24/7 can cause spats. Good luck with transforming your cage and I hope all your guys can live together!