Red Algae

Red algae all over in water.

Red algae can give the water a red or reddish brown hue but can also be green.

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Cyanobacteria in water and on rocks on shore.

Cyanobacteria are toxic bacteria that look like blue green algae: mats of green, blue, brown, or purplish red floating on the water.

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Muck is made of decomposing organic material, can be brown to black, and have an unpleasant odor.

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