A normal kreisel tank housing various moon jellyfish A kreisel tank (kreisel staying German for "spinning top rated" or "gyroscope") can be an aquarium formed just like a horizontal cylinder which is created to hold fragile animals for instance jellyfish and newborn seahorses. These aquariums offer slow, round water flow https://www.kylechamber.org/list/member/age-of-aquariums-7585