Review on π¬ 140 Ceramic Filter Media Rings by Reefing Art - Optimal Biological Aquarium Filtration Support, 0.7lb by Vickie Kraus
NOT for normal freshwater use
They are NOT 100% silica and contain aragonite. I wouldn't use them in a frwshwatwr tank unless you plan on maintaining a pH of 8 or higher.
- Rated for 20-40 gallons / 3800 ft total surface area, porous internal structure
- Difficult to tell
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