I'm getting a new cage in an about a week or so and I want it to be a really good cage for the rats. I want them to have lots of things to do and play with but I'm just not to sure on what to put in it I have hammocks and a little house I made out of fleece. I also have a hanging chew toy for them as well. What else should they have? I want my cage full of everything.. By the way the cage is a Ferret nation cage style.