Maybe they just don't like it.ALOT of rats dislike the wheel.I do not have one for my rats,as I let them roam and play with other things.They are happy with that.
You can keep the wheel in their cage,maybe they will start using it that way.If not,well don't stress it.Rats are really smart and like I mentioned,alot just will not use them.
As for balls,you can try.I have a giant rat ball...but NONE of my rats ever liked it.It is now collecting dust in my closet,because my rats don't like it.
* Lisa *
* To the world you are ONE person,but to a rat you are the world *
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* It's a rat thing...you wouldn't understand! *