Pencil urchins

Not open for further replies.


Retired Moderator
29 May 2007
Reaction score
Cape Town
Hi IMarine - IF they are reef-safe, then I will definitely take 1 (only 1 - otherwise they might end up dying from a lack of food). BUT, I must say, that I have MORE than enough algae in my tank!
I will PM you my contact details. Where in CT is "Walmer Estate" IMarine? I live in Table View/Parklands area...
27 Nov 2007
Reaction score

Pencil Urchin

(Eucidaris tribuloides)
Quick Stats
Care Level: Moderate
Tank Conditions: 72-78°F; sg 1.023-1.025; pH 8.1-8.4; dKH 8-12
Color Form: Brown, Tan
Temperament: Peaceful
Reef Compatible: No
Diet: Omnivore
Origin: Caribbean
Family: Cidaridae
The Pencil Urchin of the Eucidaris genera is also known as the Mine or Club Urchin. It has a brown, sometimes mottled body with stubby, thick spines radiating out in all directions. The spines are surrounded by basal plates. Never try to pry it out of a hole, as you will break its spines before it lets go. As it ages, its spines may become covered with coralline and other types of algae.
During the day it will seek shelter in the rocks; at night it will come out and forage for food, looking particularly for algae lawns and smaller invertebrates like sea squirts or sponges. It can be destructive to corals. It requires an aquarium with multiple hiding places and live rock on which it can graze. The rock formations should be sturdy, since the Urchin could dislodge rocks as it moves around the tank. The Pencil Urchin is very sensitive to high levels of copper-based medications and will not tolerate high levels of nitrates. If water conditions are poor, it will shed its spines.
It is extremely difficult to breed in an aquarium and has no distinguishing characteristics to help differentiate it from its mate.
It should be offered dried seaweed and some animal-based supplemental foods
Not open for further replies.