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Title: Use at your own (and your fish's) risk
Review: I've used Algaefix for a while. It does help to keep the pond clean. Previously I noticed the fish (Koi) would float up to the water surface, become lethargic, and stop eating, which lasted about 1 day or 2, and then they would come back to their normalcy. So I thought that was part of the normal course and didn't pay attention to it. Sadly, 4 of the fish, including two 20', died after the weekly Algaefix treatment 2 days ago. Learn from my mistake. Don't trust the label of the product. Stop using it.
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