This is a great filter for anyone seeking to breed fish and can be used with even the tiniest of fry. The design promotes the growth of microscopic organisms on the external sponge, which the fry are able to feed on. There are several features which make this filter both easy to use and easy to maintain. This filter has a very limited number of parts, which makes it very easy to assemble. The design also means that the filter is very easy to clean. Simply remove, rinse and replace. The filter comes with a weighted base which prevents the filter from moving. This filter can be operated with either an air pump or water pump, which do not need to be large. The filter provides both biological and mechanical filtration and the hollow centre also allows carbon to be added, which is chemical filtration. This filter can be used in both freshwater and marine aquariums. Although this filter does take up a considerable amount of space, the low height of the filter allows it to be easily concealed by plants and décor. Overall, this is an efficient filter, at relatively low cost.