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Mermaid's Fan
Udotea flabellum
Plantae›Chlorophyta›Ulvophyceae›Bryopsidales›Halimedaceae
📍 Caribbean and tropical Western Atlantic
Elegant fan-shaped calcified macroalgae on a slender white stalk. Grows in sandy areas near reefs and seagrass beds. A beautiful decorative species for low-flow areas of the display tank. Like Penicillus, it anchors in deep sand and has a natural lifespan of several months.
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Quick Facts
- flow
- low to gentle
- note
- calcified; provides calcium on die-off
- role
- beneficial — display
- placement
- deep sandbed
- lightLevel
- medium
Water it likes
- ph
- 8.1–8.4
- hardness
- 8–12 dKH
- temperature
- 73–81°F (23–27°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Not legal advice, and possibly incomplete or out of date.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.