Venom of a sea snake is highly potent. A fatal dose of venom from the Beaked sea snake, for an adult human, is only 1.5 mg. An average sized sea snake can produc 10-15 mg of venom.
... can avoid a territorial war with an adjoining encrusting organism by spreading via a tendral over it to a nearby vacant space. Once the second colony is established the connecting tendral will break.