Review on API Freshwater Aquarium Treatment 16 Ounce by Misty Thomsen

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.