tropicalfishlady
Aquarium Advice FINatic
I have a cartridge of its own for bio-media phisfriend is right,its great surface area for bb,would help a lot !!!
Mines a Fluval U2,it has 3 way filtration system,and my bio media which does come with.filter are like cylindrical.pieces good stuff,then thers 2 sponge,polycarbon cartridges