Diadema setosum

Sexing

 * Unknown

Tank compatibility

 * Due to this Urchin's excellent defences, it is an excellent algae-controller in a tank with semi-aggressive or aggressive fish.

Diet

 * This is a herbivorous Urchin and will graze on algae and phytoplankton. It can be supplemented with dry seaweed.

Feeding regime

 * How often to feed, etc.

Environment Specifics

 * It is sensitive to high levels of copper-based medications and it will not tolerate high nitrate levels. It requires ample hiding places which must be secure as this Urchin can dislodge loose live rock.

Behaviour

 * A primarily nocturnal creature with excellent defences against predators. When approached by a fish, these urchins will sense their presence, and will defend itself by directing its spines towards its offender.

Identification

 * How to id the animal.