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Long spine urchin (Diadema setosum)

Family: Diadematidae

Care level: Easy

Temperament: Peaceful

Reef compatibility: Reef safe

Max size: 26 cm

Diet: Herbivore

The long spine urchin are an interesting and useful part of the marine aquarium clean up crew, being voracious algae eaters they can make a significant impact on the control of unwanted hair algae. Provide lots of rocks for them to graze. Expect most of there grazing to take place at night or during periods of subdued lighting.

Long spine urchins are just as at home in a full blown reef tank as they are in a fish only with live rock system. They can feature in aggressive fish only tanks where other clean up crew would not survive as their intuitive use of their spines keeps them safe.

Urchins are mildly venomous and their spines are sharp so caution must be taken when handling or cleaning the tank.


Due to variations in species your item may not be identical to that featured in the image, we do however ensure the species is correct and that the markings and colors are very similar. 

Before ordering please familiarise yourself with our alive arrive guarantee and the process for making claims under our guarantee. 

We offer an 'Arrive Alive' guarantee on all corals, critters, fish and invertebrates. If they do not arrive alive then subject to these terms and conditions you can request a replacement or refund. We guarantee our livestock will arrive alive, there is no reason why it should arrive any other way due to the care and professional way in which they are packaged with heatpacks, polystyrene boxes and all other necessary precautions considered for the species we are shipping.

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Why choose us?

Customer needs and animal care are at the centre of our business

We believe you can only get value if you get quality too and most of our customers agree we’ve got the balance right. From gentle acclimation and monitoring tank mates to tailored diets we go the extra mile to ensure we offer happy, healthy, livestock.

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Really nice shop. Nice coral and fish selection and prices are good too. Fish food is also a good quality and price. Will be visiting again soon 👍

Dee Stan

May be smaller then some shops in the area but very well priced and can always find a little jem or two in here I never leave without something new for the tank

Richard Fincham