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Sargassum
Sargassum natans
Chromista›Ochrophyta›Phaeophyceae›Fucales›Sargassaceae
📍 Sargasso Sea and tropical Atlantic
The iconic free-floating brown macroalgae of the open ocean — forms dense golden-brown mats in the Sargasso Sea. In aquariums it anchors to rock or tumbles freely. Hosts an entire ecosystem of cryptic animals (pipefish, frogfish, shrimp) in the wild. Challenging to keep long-term but impressive in large displays.
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Quick Facts
- flow
- moderate
- note
- may require very bright lighting and nutrient supplementation to thrive long-term
- role
- display / biotope
- lightLevel
- high
Water it likes
- ph
- 8.0–8.4
- hardness
- 8–18 dGH
- temperature
- 68–81°F (20–27°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Not legal advice, and possibly incomplete or out of date.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.