I noticed back a while on the thread you were finding Moon Jellyfish for $170. We keep these jellyfish in stock and sell for much less at www.jellyfishart.com. Also, you don't have to get the kreisel "cylinder on its side" tank design. You can also use an upright vertical cylinder. I'm going to be posting a youtube on the site soon that will detail how to make your own jellyfish tank for less than $50 using supplies from craigslist. I know quite a bit about keeping jellyfish tanks so feel free to direct any questions my way.
