Hi there,Brand new to rats and loving them so much already. I bought a large cage at the thrift store for $15.00. I believe it's for ferrets as the bar spacing was too wide ( found that out at 3am when our rat Olive got into bed with my daughter) I covered the outside with hardware cloth and that has been fine..but the doors are small making it hard to clean and arrange. So, I ordered a double critter nation. I'm sooo (maybe too) excited about it. But I have a couple of questions...is this cage just too much for rats? Do they really use all the space? Also, does it come with a ladder for the rats to get in and out of it? If not, what do you all use?Thanks!