Filter Media

Dive Deeper: Info & Tips for Aquarium Filter Media

Filter media plays a key role in maintaining clean, stable water in reef tanks. Whether you’re removing excess nutrients, reducing odors, or keeping pH more consistent, the right media helps fill in the gaps that mechanical and biological filtration can’t cover on their own.

At Top Shelf Aquatics, we carry a range of media options — from carbon and GFO to specialty products like CO2 scrubber media. Whether you're running a reactor, using a media cup, or placing bags in your sump, having the right media in rotation can make a noticeable difference in your tank's clarity and overall balance.

Filter Media Types & Uses

We carry a broad range of aquarium filter media, each designed to support different aspects of nutrient control and biological stability in reef systems:

• Carbon Media
  Products like Reef Genetics Carbon help remove discoloration, odors, and organic pollutants. Use them passively in media bags or actively in reactors for improved water clarity.
  
• GFO & Phosphate Removers
  Reef Genetics GFO and Seachem PhosGuard are highly effective at reducing phosphate, helping prevent unwanted algae growth. These are best used in reactors with controlled flow for even tumbling.
  
• CO2 Scrubber Media
  IceCap’s color-changing CO2 absorbent media is designed for skimmer air intakes, helping raise and stabilize pH — particularly useful in systems with low ambient air exchange.
  
• Biological Media
  Products like IceCap Bio-Spheres, Bio-Cylinders, and Bio-Plates provide long-term surface area for beneficial bacteria. These are ideal for sump placement, media chambers, or even dedicated towers.
  
• Nitrate & Organic Waste Reducers
  Reef Genetics Bio Pellets, NPX Bioplastics, and Seachem DeNitrate support low-nutrient environments by enhancing bacterial denitrification or encouraging carbon-driven export.
  
• Specialty Media
  Items like Purigen by Seachem polish water by absorbing organics before they break down, while Reborn Calcium Reactor Media from Two Little Fishies supports automated calcium and alkalinity supplementation in reactor setups.
  

Whether you're fine-tuning your nutrient export strategy or establishing a biological foundation, our filter media lineup supports a wide range of reef-keeping goals — from low-maintenance softie tanks to high-demand SPS systems.

Optimization Tips

• Rinse Media Before Use
  Most granular or pelletized media — like carbon, GFO, and bio pellets — should be rinsed in RO/DI water before being added to your tank. This removes dust or fines that can cloud your water or irritate corals.
  
• Match Media to Flow Conditions
  Some media perform best in high flow (like bio pellets or GFO in a reactor), while others should be used in lower-flow areas (like De*Nitrate or CO₂ scrubber media). Check manufacturer recommendations and adjust pump speed accordingly.
  
• Use Media Reactors for Consistency
  Running media in a reactor gives you better control over flow rate and contact time — which leads to more efficient nutrient removal and longer-lasting performance.
  
• Don’t Overdo It
  More media isn’t always better. Overusing GFO, for example, can strip phosphate too quickly and stress corals. Start with the recommended dose for your tank size and adjust based on test results.
  
• Rotate Media Types Based on Tank Needs
  You don’t need to run everything all the time. Many hobbyists rotate carbon and phosphate media based on water quality or seasonal tank behavior. Keep an eye on parameters and run what makes sense for your system.

Maintenance

• Choose the Right Format for Your Setup
  Filter media can be used in reactors, media cups, mesh bags, or chamber baskets. Reactors offer the most control and efficiency, but for simple setups, media bags placed in a high-flow sump area can still be effective.
  
• Replace Media on a Regular Schedule
  Most media types have a limited lifespan. Carbon and GFO typically last 2–4 weeks depending on bio-load, while CO2 scrubber media is replaced based on color change or pH drop. Bio pellets and biological media last much longer but should still be inspected periodically.
  
• Check Flow and Buildup
  Over time, media can clump or become clogged with detritus, especially in high-nutrient systems. Regularly inspect reactors and media bags to ensure water is flowing through them properly.
  
• Clean Reactors and Media Housings
  Every 1–2 months, clean out media reactors or trays to prevent buildup and salt creep. Rinse housings with RO/DI water and gently scrub any internal surfaces where debris may collect.
  
• Store Unused Media Properly
  Keep unused media in a cool, dry area sealed in its original container or an airtight bag. For carbon or CO2 scrubber media, be sure to avoid prolonged exposure to air before use to maintain effectiveness.