I did a lot of research and about got a tank last year (I set up another reef tank instead :D). You need gentle circular flow so you will need a kriesel or pseudo kriesel type aquarium. There's some diy plans online for this type of tank or you can purchase one. I haven't heard good things about jellyfish art tanks but the cubic aquariums seem to be pretty decent if not overstocked.
From what I've read, the best food is live baby brine shrimp because they stay in the water colum and dosent settle on the bottom.
I think there's a few people on here with jellyfish so they may be able to offer more help.
