Scientific name - Chelidonura varians Common name – Black Velvet, Shield Head Nudibranch Max Size – 3 in (7.5 cm) Care Level – Difficult Temperament – Peaceful Foods and feeding – This nudibranch will only eat flatworms, and will starve when this food source is gone. Aquarium suitability - Reef compatibility – Yes Captive care – This nudibranch only feeds on flatworms and can be used to manage an infestation. But you should be able to return or rehome this nudibranch because they will starve when the infestations Is gone. They are active at night. Like all inverts, nudibranches require pristine water conditions and small amounts of nitrates or copper are fatal to them.