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Green Water (Algae Bloom)
Chlorella spp.
Plantae›Chlorophyta›Chlorophyceae›Various
📍 Worldwide in nutrient-rich freshwater
Pea-soup green tank water caused by a bloom of free-floating unicellular algae. Usually triggered by a combination of high nutrients and direct sunlight. A UV steriliser will clear it within days. A 3-day blackout is an alternative. Daphnia (water fleas) can be added to a fishless tank as biological control.
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Quick Facts
- role
- nuisance
- cause
- direct sunlight, high nutrients, poor circulation
- control
- UV steriliser (fastest fix), 3-day blackout, Daphnia culture (fishless tanks)
Water it likes
- ph
- 6.5–8.0
- hardness
- 5–20 dGH
- temperature
- 68–82°F (20–28°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Not legal advice, and possibly incomplete or out of date.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.