So graceful and otherworldly are these throwbacks to eons past that even folks with no former interest in aquariums are clamoring for Jellyfish tanks. Termed, “living art” these beautiful creatures have spurred the development of tanks and foods geared solely to their care. While some species, such as the Moon Jelly, do very well and even breed in captivity, Jellyfish care is quite complicated – and very expensive. Chief among their drawbacks is the need for specially-designed aquariums with flow-through water currents that keep these delicate invertebrates always in motion at the correct speed.