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

Longspine Urchin, Black Longspine Urchin



Tank compatibility

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

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.


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