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Green Spot Algae
Coleochaete orbicularis
Plantae›Chlorophyta›Chlorophyceae›Coleochaetales›Coleochaetaceae
📍 Worldwide in freshwater
Hard, dark green circles on glass and slow-growing plant leaves — familiar to virtually every planted tank keeper. Caused by low phosphate (counterintuitively) and high light. Nerite snails are the most effective control. A small amount is considered normal and harmless.
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Quick Facts
- role
- nuisance / normal
- cause
- low phosphate, high light on glass
- control
- Nerite snails, raise phosphate slightly, reduce light