Healthy for fish and nice to look at: Aerator pumps, such as the OASE OxyMax, supply all water inhabitants with activated oxygen. Moreover the flow provides an attractive visual effect. But that's not all: An additional aerator pump supports the filter because the small micro-organisms in the filter foams also benefit from the oxygen. Three convincing arguments for use of an air pump, such as the OxyMax. It is also available as a complete set including hose, and therefore is immediately ready for operation.