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Derbesia
Derbesia sp.
Plantae›Chlorophyta›Ulvophyceae›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