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Planktonic Algae blooms cause the water to turn a pea-soup green color. Not only does planktonic algae ruin the aesthic look of your pond, it can cause a great danger to fish when trying to treat it. What happens is when the planktonic algae dies off rapidily, from either weather change or treating the water with an algaecide, it will deplete oxygen from the water, possibly causing a fish kill if the oxygen depletion is great enough. Although it is not a 100% guarantee to prevent a fish kill, having an aeration system will reduce the possible risk of one.
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