Superfish Bio Air Filter L substrate so you can see what

so you can see what you are removing

All Tidal Filters come with Seachem's Matrix bio-media and a foam filter to get you started

It contains alkanes

Unlike solid gravel

The individual cartridges are easy to link together

Superfish Bio Air Filter L substrate so you can see whatAir driven sponge filter with the highest yield of aerobic bacteria, ensures clean and healthy aquarium water. Sponge filter with chambers for biological filter media, ideal for small aquariums and breeding tanks. Filter media space Integrated biological filter media compartment (filter media NOT included!) for advanced filter performance. Please note: An air pump is needed and NOT included! 27. 5 x 15 cm