This kind of animal has high requirements on water quality and temperature. If you raise it well, you can live for a while. If the water quality is poor, you will die within one to seven days. Although there are many kinds of jellyfish, most of them live in seawater and feed on plankton. Jellyfish, after all, is a living thing, with its basic living habits and requirements for water quality, water flow and food. Ordinary cups, without water flow and filtration, are completely stagnant water, not to mention jellyfish, and fish will die if they are put in. It's only a matter of time.