Caulerpa filiformisis commonly referred to as Green Seaweed. Difficulty in the aquarium: There are no reports available yet that this animal has already been kept in captivity successfully. Toxicity: Toxic hazard unknown.
Caulerpa is a genus of seaweeds in the family Caulerpaceae (among the green algae). They are unusual because they consist of only one cell with many nuclei, making them among the biggest single cells in the world. A species in the Mediterranean can have a stolon more than 3 m long, with up to 200 fronds. This species can be invasive from time to time.
Referring to its thalli's crawling habit, the name means 'stem (that) creeps', from the Ancient Greek kaulos ( ‘stalk’) and herpo (‘to creep’).