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A phylum of gram-negative bacteria that obtain energy via photosynthesis (Autotrophs). Commonly referred to as Blue-green Algae, Cyanobacteria are not scientifically classed as algae. Some Cyanobacteria produce toxins that can cause acute illness following consumption or skin exposure. Cyanobacteria blooms usually form in warm, slow-moving waters rich in nutrients and can cause significant problems for water users.