Summarize the following:
You can house your jellyfish in an aquarium tank that is clean and sterile. You may decide to have only one to three small jellyfish in a small tank that you can fit on your desk at work or at home. Or, you may go for a medium sized aquarium tank that can fit a larger number of jellyfish. Look for a tank that is circular in shape or tall and narrow. A tank that is circular, with a flat base, is ideal as the shape can allow your jellyfish to float in the tank water. This is essential for the health and happiness of your jellyfish. The other option is to buy a tank kit that is made specifically to house jellyfish. These tanks come in a small size, which is usually circular in shape to house one to three small jellyfish. You can also get tall, narrow tanks for a larger number of jellyfish. You can purchase jellyfish tank kits online or at your local pet store. Keep in mind jellyfish tank kits are not cheap, ranging from $350 - $600. You may want to try using an aquarium tank instead to save money on your set up. Most jellyfish tank kits come with the supplies necessary for setting up the tank. If you are using a fish aquarium to house your jellyfish, you will need to purchase several other supplies, including:  An air pump An undergravel filter plate An air tube Airline tubing Substrate for the bottom of the tank, such as glass beads An LED light An LED remote control (optional)

Summary:
Look for a small to medium sized aquarium tank. Buy a jellyfish tank kit. Get the other necessary supplies.