I love my girls so much and I give them free range time for at least 3 hrs a day and I spend about 1 hr with them during that time. I wrestle with them and pretend chase them with my hand. (There are days, however, when I can only spend 15 minutes or so with them and they're just out free ranging.) They popcorn and runaway and come back and crawl on me, etc. I guess that's all fine.When they are in their cage, they just sort of hang out in their hammock or tube or dome. I have lava rock stuff and toilet paper rolls stuffed with stuff, and rope ladders, etc., but they never use them. They don't seem to play. I don't want them to be bored and unhappy. What can I do or provide them?I just feel like they just don't do much other than when I "play" with them. And they are 6 month old girls who can't sit still. Just confused. I've only had a male rat previously, who just liked to hang out with me. So, I want to make sure I'm being a good mom.