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Fish Tank Supplies > Fish Tank Filter Accessories > Fish Tank Filter Media > Biological Filter Media

Biological Filter Media


Biological filter media gives beneficial bacteria a place to colonize and remove toxins produced by organic waste - the single most important process for the health of your aquarium. Choose biological filter media by the type of filter you are using, and how much surface area you need (if you have a heavy bio-load, maximize surface area). Denitrifying bacteria are aerobic; keep oxygen levels healthy with an air pump or aerating water pump.

When it's time to clean your media, don't remove it all at once - bacteria takes a while to get established and removing it leads to catastrophic spikes in ammonia and pH. If your filter isn't designed for partial media changes, pack multiple filter bags only rinse one at a time in aquarium water. Browse by brand, type, or scroll down for our complete selection!

Shop by Type

Shop by Brand






Bio-Balls






Ceramic Rings






Biological Filter Gravel and Substrates






Foam Blocks and Inserts





Shop by Featured Products

Filstar Bio Chem Stars
Regular Price: $7.56





Eheim Ehfimech 1 Liter
Regular Price: $11.16





Eheim Ehfimech 5 Liter
Regular Price: $40.59





Eheim Substrat Pro 2.0L
Regular Price: $24.35





Aqua Clear 20 (Old Mini) Foam Block 1pk
Regular Price: $1.31





Aqua Clear 30 (Old 150) Foam Block 1pk
Regular Price: $1.31





Aqua Clear 50 (Old 200) Foam Block 1pk
Regular Price: $1.19





Aqua Clear 70 (Old 300) Foam Block 1pk
Regular Price: $2.22





Aqua Clear 110 (Old 500) Foam Block 1pk
Regular Price: $5.07





Aqua Clear 50 (200) BioMax
Regular Price: $3.34





Aqua Clear 70 (300) BioMax (Hagen)
Regular Price: $4.36





Aqua Clear 110 BioMax (Old 500) (Hagen)
Regular Price: $7.40





Aqua Clear 20 (Mini) BioMax (Hagen)
Regular Price: $2.22





Aqua Clear 30 (150) BioMax (Hagen)
Regular Price: $2.22





Fluval Prefilter 750gm (26.40oz)
Regular Price: $7.01





Fluval Filter Foam Block 104 2pk
Regular Price: $3.04





Fluval Filter Foam Block 204/304 2pk
Regular Price: $3.75





Fluval Filter Foam Block 404 2pk
Regular Price: $4.87





Fluval 2 "Plus" Foam Insert 4pk
Regular Price: $5.31





Fluval 3 "Plus" Foam Insert 4pk
Regular Price: $6.08





Fluval 4 "Plus" Foam Insert 4pk
Regular Price: $7.29





Poly Pads for Fluval 3 "Plus" 4pk
Regular Price: $5.07





Poly Pads for Fluval 4 "Plus" 4pk
Regular Price: $6.08





Fluval Filter Foam Block for FX5
Regular Price: $12.17





Fluval BioMax Media 500g (17.63 oz.) (Hagen)
Regular Price: $8.11





Bio-Balls PCML for 160, 220, 360, 530 Filters
Regular Price: $5.92





Ceramic Rings PCML for 160, 220, 360, 530 Filters
Regular Price: $5.12





Bio Balls - 1 Gallon
Regular Price: $11.42





Fluval Underwater Filter Bio-Max
Regular Price: $3.49





Fluval G - Nodes Biological Filter Media
Regular Price: $15.95





Ehfisubstrat Pro 1L
Regular Price: $15.22





Fluval Edge Foam and Bio Max Filter Media Set
Regular Price: $3.04





Ovation 210 Replacement Media - 1 pk
Regular Price: $2.69





Ovation 380 Replacement Media - 1 pk
Regular Price: $3.33





Ovation 700 Replacement Media - 1 pk
Regular Price: $4.37





Ovation 1000 Replacement Media - 1 pk
Regular Price: $5.08





Small Bio Sponge for 316 Internal
Regular Price: $1.61




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