This 7-gallon Jellyfish Tank – a project that got funded through Kick-starter. This tank does differently is that it filters the water using a laminar flow, along the walls of the tank, creating controlled swirls which continuously nudge the jellyfish to the center of the tank and away from danger. The kit comes with everything you need to get setup, includes a voucher for three moon jellyfish and some food. The price is $499.(no cheap!) And life expectancy of a moon jelly is only a year; new ones cost $50 each.