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Blue-Green Algae (Freshwater)
Cyanobacteria spp.
Family: Cyanobacteria
📍 Worldwide — ponds, slow rivers, aquariums
A blue-green or red-brown slime that coats the substrate, plants, and glass with a slimy, foul-smelling mat. Technically a bacterium, not true algae. Caused by low nitrates, poor flow, and organic waste. Responds to a 3-day blackout combined with the antibiotic erythromycin or hydrogen peroxide treatment.
Keeping this species
- role
- nuisance — urgent
- cause
- low nitrates, poor circulation, excess organics
- control
- 3-day blackout, H₂O₂ treatment, improve flow and detritus removal
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Natural Habitat Temperature
68°F — 82°F seasonal range · (Jan low, Jul high)