An aquarium water filtering system includes a first filtering section (200), a second filtering section (300), and a third filtering section (400). The first filtering section (200) has a first housing (205) configured to receive water, perform a first filtering action on the received water, and produce a first filtered water. The second filtering section (300) has a second housing (301) placed horizontally adjacent to the first housing (205) and configured to receive first filtered water, perform a second filtering action on the first filtered water, and produce a second filtered water. The third filtering section (400) has a third housing (405) placed horizontally adjacent to the second housing (205) and configured to receive the second filtered water, perform a third filtering action on the second filtered water, and produce a third filtered water for return to the aquarium. The second filtering section (300) includes: a distribution plate (360) configured to distribute the first filtered aquarium water over an interior of the second housing (205)； a biological filter material (325) located below the distribution plate (360) and configured to perform a portion of the second filtering action； and a UV light (391-397) configured located above the distribution plate (360) and configured to irradiate water passing through the distribution plate (360).Selon l'invention, un système de filtration d'eau d'aquarium comprend une première section de filtration (200), une deuxième section de filtration (300), et une troisième section de filtration (400). La première section de filtration (200) comporte un premier boîtier (205) configuré pour recevoir de l'eau, effectuer une première action de filtration sur l'eau reçue, et produire une première eau filtrée. La deuxième section de filtration (300) comporte un deuxième boîtier (301) placé horizontalement adjacent au premier boîtier (205) et configuré pour recevoir la première eau filtrée, effectuer une deuxième action de filtr
