Pencil Urchin

Eucidaris tribuloides


(3 Reviews)

Pencil Urchin

Pencil Urchin

Eucidaris tribuloides


(3 Reviews)

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Pencil Urchin Care Facts

Care Level: Easy
Temperament: Peaceful
Diet: Omnivore
Reef Safe: Yes
Minimum Tank Size: 20 Gallons
Max Size: 6 inches
The Pencil Urchin, Eucidaris tribuloides, is a small, spherical hard shelled sea animal covered in mildly poisonous protective spines. This species eats primarily algae and detritus but will take additional supplemental feedings. Care should be had if they are kept with corals as they can sometimes trample over them.  The Pencil Urchin is best kept in a tank with plenty of live rock as it will scavenge at night for its food moving freely around the tank.

Very hardy. Purchased in 2016 and still going strong in 2022 despite periods of poor water conditions. WARNING: Despite what is said, they will decimate corals. This guy ate all of my coral. Do not recommend if you want to keep corals. Kept in Biocube 29.


Reviewed by: Scott Bell on Nov. 9, 2022

Arrived healthy and active! These guys are a great addition to any tank, fun to watch. They move more than I expected.


Reviewed by: Teresa Pettit on June 30, 2017

Great for hair algae


Reviewed by: Teresa on April 22, 2016

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