Mechanical AquariumMechanical Aquarium Assemble & Watch the fish swim! The Mechanical Aquarium from Ugears is an ingenious saltwater aquarium, with two pet tropical fish chasing each other around a forest of macroalgae fronds, inside of which hides another small inhabitant of the marine environmenta seahorse! The fish and algae rotate simultaneously and in parallel, at different speeds and in different directions, simulating the smooth, undulating rhythms of underwater