This product is designed to provide the chemicals and formulation found in blackwater to encourage spawning. However, I'm sure it does a great job; If you are expecting this product to give your aquarium a dark water tint, FORGET IT. It temporarily colors the water a fluorescent lime green for about 12 hours. After passing through the filters, the water returns to its original color. I think the fish seemed to respond positively and be in a better mood overall.
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