Fluval AquaClear 110 Bio-Foam (Blue) – A bio-foam insert for the AquaClear 110 filter that provides both mechanical and biological filtration. Its foam structure traps debris to clarify the water and also offers a vast surface area for beneficial bacteria colonization. By using Bio-Foam in the AquaClear 110, you enhance the filter’s ability to remove waste particles and simultaneously maintain a robust biological filter, contributing to stable and healthy water conditions in big aquariums.