I would give this product more stars if I could. I put it in a Cascade canister filter that works in my 50 gallon aquarium. The water was already pretty good, but now the clarity is exceptional (see photo). All the plants are doing much better and the fish are healthy and thriving in all 17. Please note that this product is specially designed for freshwater and planted aquariums. It draws no fertilizer. You will NOT be disappointed with this product, it's fantastic. Buy with confidence.
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