Longspine Urchin (Diadema setosum)

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Longspine Urchin

Diadema setosum6642.jpg
Longspine Urchin

Diadema setosum

208 Litres (55 US G.)

20.3-25.4cm (8-10 ")


8.1 - 8.4

22.2-25.6°C (72 -78 °F)

8-12 °d

1:1 M:F

Other (See article)

3-5 years

Alternative names[edit]

Longspine Urchin, Black Longspine Urchin



Tank compatibility[edit]

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


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

Feeding regime[edit]

How often to feed, etc.

Environment Specifics[edit]

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.


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.


How to id the animal.


External links[edit]