After a few days in my green aquarium it is still green. Perhaps a minimal improvement, but in reality this "green water killer" did little despite what others report successes - $43 wasted. UPDATE: I've increased my rating from 1 to 3 stars. after many more days with the pump constantly running, the water is mostly clear. I like the fact that it seemed to work, but less so the fact that it took about 10 days and having this large piece of equipment in my 30 gallon for an extended period of time definitely doesn't affect the aesthetics of the tank much.
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