Random question.....

The best tanks I've seen for jelly are round, the jellys don't swim real strong and can get trapped in corners.
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...So you know how to care for jellyfish? I may have to pester you if I ever decide to get them :) the reviews on the Desktop Tank said all of their jellies would shrink, get holes in them, and die, and that the tank needed a filter system and a couple other things. They seem very high maintenance.

I have never kept them myself. Though, as I mentioned, I looked into it. And have seen them kept hands on. Short story, super clean water, slow steady water flow, no corners or decoration the jellys can get trapped in or on. The ph and such are super important. Most set ups I've seen are a small (30 gallon) viewing tank with up to and over 200 gallon sumps.
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What do jelly fish eat? Plankton?

That depends on the jelly. Anything from micro fauna to whole fish or shrimp
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Why is it chicken do not like to go out to eat---they alway get stuck with the bill !!!! Do fish have eye lids ? If you put peanut butter in your Jelly fish tank dose it attract them to it ?