Glad to hear that they are doing so well! Mine are feisty and I *still* have to attempt to get them as only Rota will jump on my hand. heh.

You're probably right about the deeper gerbilarium. Some gerbils prefer to have some really deep ones. I, don't know why because I planned on doing this as well, never bookmarked some but if you do a google search then you could probably come up with some nifty ideas. I will edit my post if I find anything good!

Edit: http://exoticpets.about.com/library/...gerbilcage.htm This is a pretty good one. Then, http://exoticpets.about.com/od/gerbils/ , their main area, has some good things. I have the gerbil colour pallette bookmarked, though.