Yeah I liked the look of the gerbillarium too. But I looked at that website and saw that you could mix rotastak with a tank. I'll have to go to the petshop again and get them one of those big plastic tanks and see if they have some peat or something they can dig around in. They don't look pregers... yet... evil shop keeper! lol. I'd feel aweful if they had babies, it's really not fair to keep gerbils on their own and i wouldn't want to seperate them. I'd end up keeping babies! lol.