More Details: Blue-green Algae and Health
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Surface water affected by blue-green algae often is strongly colored (blue-green, green, yellow, white, brown, purple, or red) and can have a paint-like appearance. Under some conditions, blue-green algae can become so abundant that they form floating mats or scums on the water. Blooms can also form on rocks, along the shoreline, and at the bottom of a waterbody. These are called benthic blooms.
