Jellyfish tank
http://www.jellyfishart.com/default.asp
http://www.jellyfishart.com/Tanks-s/1.htm
I suspect this is just another bad product and bad idea... I mean, don't moon jellies grow as large as this whole system? The advertisement on the site where they picture a clown fish, some gobies, and a few jellies together in the bare tank is even worse than when they put a fat goldfish picture on a quarter gallon bowl. But if anybody out there knows better, I'd love to here about it - the inventer of this thing just seems so genuine.
It is a 7 gallon tank with a false wall on one side that creates an air driven under gravel type filter. That's it.
On the good side, you can actually order the animals from this site...