Sea Lettuce

Ulva lactuca

Also known as Sea Grass, Green Algae Sheet

Plantae›Chlorophyta›Ulvophyceae›Ulvales›Ulvaceae

📍 Worldwide — intertidal and subtidal zones

Bright green, tissue-thin sheets of macroalgae familiar on coastlines worldwide. Fast-growing nutrient exporter and a relished food for tangs, urchins, and rabbitfish. Tolerates a very wide temperature and salinity range. Can become weedy if not harvested — keep export-focused.

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Quick Facts

flow: moderate
note: excellent herbivore food; harvest frequently to export nutrients
role: beneficial — food and nutrient export
lightLevel: medium to high

Water it likes

ph: 7.8–8.3
hardness: 8–18 dGH
temperature: 59–72°F (15–22°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Not legal advice, and possibly incomplete or out of date.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.