Cheaper than Flourish Excel and does the same. Warning, this can harm your fish and even some plants. My plants are doing great and I can't link that to the death of the fish. I've had TWO fish kills (knock on wood) in the 18 months of using this product and I can't say they were caused by this product. To be clear, I probably have about 100 fish. If you don't want to tune CO2 or don't have time to tune such a system, then this is a good alternative.
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