I've seen a lot of people recommend against the Nano Cube (if you're referring to the JBJ one) because they have problems with cracking. I personally got a cheap Eclipse 12 (which I recommend against, since it's acrylic and scratches easily) for my nano but only because my LFS gave me "lesser" advice and I hadn't found this site in time. Many people on these boards have recommended either the Aquapod or Biocube tanks and I wish I would have started with one of those. For the money, you could start out great with the Aquapod, dr foster smith sells them really cheap. Hope that helps some.