ahh I've seen this before. I believe it's on the bi-orb website. Interesting looking, but very impracticle in my mind and where do you put the heater, the filter and how do you get out dead fish and clean the bloody thing?
stupid things, completely impractical for most any fish due to the low surface area. Totally unsuitable for anything other than possibly a Betta or some guppys.
That would be good for a live bearer tank, as it looks like it doesn't have fast currents in the tank. Other than that its like an oompa loompa acid trip, very cool .