Hobby Bubble Air 2 is a air-operated internal filter with a multifunctional, biologically and mechanically effective filter system. The filter system has a high filter performance and is 100% shrimp-safe and can also be used to breed the smallest juvenile fish. The sponge filter is a biological-mechanical filter. The sponge retains the organic substances that are absorbed by the filter and offers microorganisms a huge surface area. The bacteria then convert pollutants into harmless and sometimes useful substances. This ensures a biological balance in the aquarium. The modification of the filter outlet increases the surface movement, which leads to a better oxygen supply and water movement in the aquarium. The height-adjustable filter outlet can be optimally adapted to the water level of the aquarium. The Hobby Bubble Air Filter is attached using the suction holders supplied. Hobby Bubble Air Filters are perfect for nano aquaria and smaller rearing aquaria. The Hobby Bubble Air Filters