Cute baby!
We use these on our corn's tank...they are tight as heck! I have 8 around the tank. The top is a hinged one though, so I only deal with 4 of them on a regular basis. http://m.petco.com/product/4353/Petc...ity-Clips.aspx

My baby ball is in a zilla critter cage...which I love. It's way easier than dealing with clips, but she will need an upgrade soon and unless I can find a cheap zilla critter cage on CL, she'll be in a 20L with clips, too.