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Derbesia
Derbesia sp.
Plantae›Chlorophyta›Ulvophyceae›Bryopsidales›Bryopsidaceae
📍 Worldwide in tropical seas
Fine, fluffy dark green tufts that resemble a softer version of Bryopsis. Often appears in high-nutrient systems and around powerhead intakes. Like Bryopsis it is resistant to most herbivores. Sea hares will consume it; magnesium treatment (1500–1800 ppm) is effective. Reducing phosphate below 0.05 ppm also helps.
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Quick Facts
- note
- similar to Bryopsis but softer and less resistant
- role
- nuisance
- cause
- high phosphate, new tank, insufficient herbivore pressure
- control
- Sea Hare (temporary), magnesium treatment, reduce phosphate
Water it likes
- ph
- 7.8–8.4
- hardness
- 8–12 dGH
- temperature
- 64–79°F (18–26°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Not legal advice, and possibly incomplete or out of date.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.