In a gerbilarium it's the same with any animal, he can get his feet stuck and if they get stuck he can break his leg (A friends degu did this). The cage I have is basically a gerbilarium but with solid shelves, not wires. You could probably buy more levels separately, dunno what cage you're talking about though

What I was saying is you don't need to put 2 cages together like I did, you can just buy one if you wanted, I just wanted one with a tank for a base because they throw the hay around everywhere, and this way they have an extra level

Tempted to get him but I'm trying to save money >_< Plus I want gerbils first!

Peace
Akai-Chan