- 1). Reduce the amount of light on your pond, if possible. Planting some taller, potted plants like bamboo to shade the pond can be a good start.
- 2). Test your water for silica. In many cases, brown algae growth is a result of excess silica.
- 3). Change the brand of sea salt you add to your pond. In many cases, low-quality sea salt contains excess silica. If your pond tested high in silica, change salt brands.
- 4). Test your water. Some municipal water supplies have high silica content. If your tap water tests for high silica, switch to reverse osmosis-filtered water or distilled water.
- 5). Change the sand in your pond as a last resort. Many sands contain excess silica. Replace the existing sand with sand that actually came from the ocean.
- 6). Test your pond for high phosphates and nitrates with an aquarium test kit. If your phosphate or nitrate levels are high, start changing your water more often.
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