Black Long Spine Urchin (Diadema setosum)

Max Size: 10 inches
Diet: Herbivore
Temperament: Peaceful
Reef Compatible: Yes
Minimum Tank Size: 50 gallons

The Black Longspine Urchin, also known as the Long-spined Sea Urchin, features a predominantly black body with a distinctive red eyespot at the center. Its long and thin spines are entirely black, lending it a delicate appearance, though it is surprisingly adept at self-defense. This urchin species serves as an excellent algae controller in aquariums housing aggressive fish.

To provide a suitable environment for the Black Longspine Urchin, ensure the aquarium has ample hiding places and enough space for it to move around freely. As a nocturnal creature, it will remain hidden during the day and emerge at night to forage for food, primarily algae and seaweed. These urchins are particularly beneficial in aggressive aquariums where other invertebrates may be at risk of being consumed by the resident fish. When approached by a potential threat, the Black Longspine Urchin can sense it and will defend itself by directing its spines towards the intruder.

It is crucial to maintain proper water quality, as the Black Longspine Urchin is sensitive to high nitrate levels and can be adversely affected by copper-based medications. Shedding of its spines can indicate poor water conditions.

It's important to note that the Black Longspine Urchin is venomous, and its sting can be similar to that of a bee sting. Caution should be exercised when handling this urchin.

To supplement its diet, dried seaweed can be provided to ensure its nutritional needs are met.