All FLUVAL EXTERNAL FILTER MEDIA FLUVAL EXTERNAL FILTER MEDIA Fluval Bio-Foam, 1 piece A236£3.91 Fluval Bio-Foam, 2 pieces A237£5.51 Fluval Biomax 500g£8.95 Fluval Foam Filter Block for 104/105/106, 2 pieces A220£5.91 Fluval Foam Filter Block for 204/205/206 and 304/305/306, 2 pieces A222£9.27 Fluval Foam Filter Block for 404/405/406, 2 pieces A226£9.83 Fluval FX5 Filter Foam, 3 Pack A228£14.71 Fluval FX5 Water Polishing Pad, 3 Pack A246£7.83 Fluval FX5/6 Bio-Foam A239£9.43 Fluval FX5/6 Carbon Impregnated Foam Pads A249£9.51