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Long Spine Urchin

Long Spine Urchin

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Diadema setosum

Due to variations within
species, your item may not look identical to the image provided. Approximate
size range may also vary between individual specimen

Care Level: Easy

Temperament: Peaceful

Color Form: Black, Blue,
Green, White

Diet: Herbivore

Reef Compatible: Yes

Water Conditions: 72-78?
F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025

Max. Size: 10"

Venomous: Yes

Origin: Caribbean, Fiji,

Family: Diadematidae


The Black Longspine Urchin, also known as Long-spined Sea
Urchin, has a body which is predominately black with a red eyespot in the
center. The spines on these urchins are long, thin and completely black. They
are a very delicate looking urchin, which are actually very capable of protecting
itself. These urchins are excellent algae controllers for an aquarium housing
aggressive fish.

Provide an aquarium with ample hiding places and room to
roam. Being a nocturnal creature, the Black Longspine Urchin will hide during
the day and only come out at night to forage for food such as algae and
seaweed. These urchins are an excellent algae controller for an aggressive
aquarium where other invertebrates would be eaten. When approached by a fish,
these urchins will sense their presence, and will defend itself by directing
its spines towards its offender.


It is very sensitive to high levels of copper-based
medications and will not tolerate high nitrate levels. If it begins to shed its
spines, it is a sign of very poor water quality.


Be aware, it is venomous, with its sting being roughly
equivalent to that of a bee sting.


The diet may be supplemented with dried seaweed.