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Spirogyra
Spirogyra sp.
Also known as Spirogyra Algae, Water Silk, Mermaid's Tresses
Plantae›Charophyta›Zygnematophyceae›Zygnematales›Zygnemataceae
📍 Worldwide in slow-moving freshwater
Bright green filamentous algae with distinctive spiral chloroplasts. In small amounts it's a natural part of the ecosystem and a food source for many invertebrates. Can quickly overtake a tank if nutrients or CO₂ are out of balance. Best controlled by reducing phosphates and manual removal.
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Quick Facts
- role
- nuisance / natural
- cause
- high phosphate, low CO₂
- control
- reduce nutrients, manual removal, Amano shrimp
Water it likes
- ph
- 6.5–8.0
- hardness
- 4–18 dGH
- temperature
- 59–77°F (15–25°C)
Legality
No state or federal restrictions on record for this species.
Not legal advice, and possibly incomplete or out of date. Rules vary by state and locality and change over time — always confirm the current regulations with your state wildlife or agriculture agency before buying, keeping, or shipping this species.