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High phosphate encourages the growth of plants and algae. Its sources are typically water runoff from a fertilized lawn or garden or well water. If you fertilize your grass, switch to a fertilizer with “NO” Phosphates. While plant growth can be wonderful, algae growth is rather unsightly. In extreme cases when both plants and algae have taken over a pond it can be deadly to the fish. Both fish and plants are striving for air and generally the plants win this battle. Generally we say that plants add oxygen to the water. This is true but only to an extent. During the photosynthesis process plants are producing oxygen in the day time. At night, they take all that oxygen back in order to prepare for the following day. Thus, depleting the oxygen levels in the water. Aquatic animals can no longer survive when their air supply has been used up.

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