Great stuff. I use Matrix in all my aquariums. 90 g, 135 and 220 gallons. Once the loop starts on that media, it does what it's supposed to do. Larger aquariums may take a little longer to start the cycle. But it's worth it. All my aquariums have a strong circuit, even when overfilled they are constantly 0 ammonia, 0 nitrite and even after several years of use in several canisters 0 nitrate!. Be sure to flush the matrix before use to prevent clouds of dust from being blown into the aquarium.
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