Seachem Matrix 250ml
Matrix™
- High capacity biofiltration
- Controls ammonia, nitrite, and nitrate
- Highly porous – enormous surface area (>~700 m2/L)
- Supports aerobic and anaerobic bacteria species
Overview
Matrix™ is a high porosity biomedia that provides efficient biofiltration for the removal of nitrogenous waste. Matrix™ is a porous inorganic solid about 10 mm in diameter. Each liter of Matrix™ provides as much surface (>~700 m2) as 170 liters of plastic balls! Plastic bio-materials provide only external surface area, whereas Matrix™ provides both external and internal macroporous surface area. These macropores are ideally sized for the support of nitrifying bacteria.
| Specification | Value |
|---|---|
| Volume | 250ml |
| Material | Porous inorganic solid |
| Particle Size | 10 mm diameter |
| Surface Area (per liter) | >~700 m² |
FAQ
How does Matrix™ compare to traditional plastic bio-balls in terms of surface area?
Each liter of Matrix™ provides more than 700 m² of surface area, which is equivalent to the surface area of 170 liters of plastic balls. Matrix™ offers both external and internal macroporous surface area, while plastic balls only provide external surface area.
Is Matrix™ suitable for both aerobic and anaerobic bacteria?
Yes, Matrix™ supports both aerobic and anaerobic bacteria species, making it effective in managing ammonia, nitrite, and nitrate levels in aquarium systems.
What is the recommended usage volume for Matrix™ in a tank?
Please contact customer service for specific recommendations based on tank size and fish load.

Molly Paterson –
I’ve used Matrix™ in my 55-gallon freshwater tank for three months. The water parameters have stabilized much faster than before. Ammonia and nitrite levels dropped significantly. The media seems to hold up well and doesn’t clog easily. Great for new tank setups.
Nicola Reid –
It’s a noticeable improvement over plastic media. The surface area is much higher, and I see better bacterial colonization. I added it to my filter and noticed a cleaner flow. Works well with my community fish.
Ruth Walsh –
After switching from ceramic rings to Matrix™, my nitrate levels have been stable for over two months. The media is easy to clean and maintains its structure. I recommend it for both new and established tanks.