"The Marina Bottom Filter is designed for small aquariums up to 37.8 litres (10 U.S. gal.) in size. It provides gentle filtration that is ideal for tanks containing fragile inhabitants such as small community fish and baby fry."
This is a filter that must be used with an air pump, along with airline tubing. We strongly recommend using a check valve with your air pump to prevent water from damaging it.
This filter does not come with internal filter media. We recommend using a combination of carbon, poly-fill/sponge, and bio-material such as lava rocks.