Works absolutely perfectly! The water in my tank is crystal clear (10 gallons) and the nitrate/nitrite levels have never been more stable. The only "problem" is that it bubbles up too fast for a beta fish, but I fixed that very easily by installing an airflow regulator along the hose from my pump (sold separately). I love how quiet it is and I'm glad I have to say goodbye to changing the charcoal filter!
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