Codium (Sea Sponge Weed)

Codium sp.

Plantae›Chlorophyta›Ulvophyceae›Bryopsidales›Codiaceae

📍 Worldwide in temperate and tropical seas

Spongy, dark green dichotomously branched macroalgae with a velvety, foam-like texture. Attaches to rock and can grow quite large. In temperate reef tanks it is a natural part of the fauna; in tropical tanks it can become invasive. Slugs (nudibranchs) and sea hares may graze it.

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Quick Facts

flow: moderate
note: more common in cooler-water setups; can spread aggressively in warm tropical tanks
role: display / occasional nuisance
lightLevel: medium

Water it likes

ph: 7.8–8.3
hardness: 8–18 dGH
temperature: 64–75°F (18–24°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Not legal advice, and possibly incomplete or out of date.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.