Wet/Dry Versions. The media is small rocks. About 10 pounds. I know I would need to clean them, but these pumps are really easy to clean. The hoses have a lock on them to stop suction and keep water in the lins while removing the cartridge. No priming needed, the whole process would only take about ten minutes. I would be using my 12 gal
nano for the fuge, has lights and all.
Here is some info on the Eheim Wet/Dry
Since EHFISUBSTRAT is used as the only filter media, it offers a surface area for bacteria colonization 10 times that of a trickle filter with the same dimensions. The water movement within the filter is bi-directional allowing for extended contact time between the bacteria colonies, oxygen and the toxins to be decomposed giving this filter a much quicker breakdown time than the standard filters. (Ammonia 73% and nitrite 67% faster)
In addition, due to the bi-directional water flow within the filter it mechanically breaks down larger debris rather than trapping them. As a result its service life is extended to approximately one cleaning every six months.