I got my first female gerbil who is 8 months old 2 weeks ago and my new female gerbil who is 3 months old 2 days ago they started fight when i introduced them to eachother so i did the split cage method using a strong cardboard box and a wire cloth and tape.. Now there not really interacting with eachother.. What should i put in the split cage method? Do i scatter food? Do i put there wheels in there? Any tp rolls for them to chew? I put toilet paper in there for them to chew up for bedding