Bryopsis

Bryopsis sp.

Plantae›Chlorophyta›Ulvophyceae›Bryopsidaceae

📍 Worldwide in tropical and subtropical seas

Feathery, fern-like dark green algae that is notoriously difficult to eliminate — one of the most persistent reef tank nuisances. Resistant to most herbivores. Best controlled by raising magnesium to 1500–1800 ppm for 2–4 weeks (magnesium treatment). Sea hares will consume it but are not a permanent solution.

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Quick Facts

role: nuisance — difficult to remove
control: magnesium treatment (1500–1800 ppm for 2–4 weeks), Sea Hare (temporary)
warning: resistant to most herbivores and chemical treatments

Water it likes

ph: 8.1–8.4
hardness: 8–18 dGH
temperature: 72–81°F (22–27°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Not legal advice, and possibly incomplete or out of date.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.