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These are also called red tides. They can occur naturally, but are also caused by: excess nutrients (pollution containing protein or carbohydrate); heat pollution; and iron-rich pollution: http://en.wikipedia.org/wiki/Red_tide#Causes
Thank you Sid. I suppose that red algae is a genetic mutation, suffice it to say some type of mutation that occurred with the fracturing of its genetic codons, yes?
DNA is an interesting language.