Just make sure to give 'em a little dog food or rawhide chewbones to keep their teeth worn down. Ours love both. We just had to cut our hairless boy rats's bottom teeth today because he couldn't close his mouth. He chews on everything and his teeth don't seem to wear down as quickly as the girls do. I don't know, but he sure loves his dog food and cheerios. They love whole grains like plain cheerios, wheat bread, uncooked wheat pasta, etc. Keeps 'em regular If they do end up having issues chewing up their water bottles or jumping on them, I found a great way to stop that right then and there. Take some tape and wrap it around with the sticky side out or use double-sided tape and wrap it around the top of the water bottle. Then generously sprinkle cayenne pepper on the tape. It stopped our from hanging on the water bottle and chewing holes in the lid of the tank and chewing holes in the water bottle. Goofy boogers. Anyway, hope that helped.