Pincushion Urchin (Lytechinus variegatus)
An excellent addition to reef aquariums, the Pincushion Urchin is known for its effective algae grazing and detritus removal. Its unique spiny appearance adds visual interest and helps maintain a clean, balanced environment.
Perfect for beginner reef keepers, this species contributes to aquarium health by controlling unwanted algae growth without harming corals or other invertebrates.
Feed with dried seaweed sheets when natural algae are fully consumed. Max size reaches 8 inches; shipping size is typically 2 to 3 inches.
| Feature | Detail |
|---|---|
| Species | Lytechinus variegatus |
| Size (Max) | 8 inches |
| Shipping Size | 2″ – 3″ |
| Diet | Dried seaweed sheets (supplemental) |
| Environment | Reef aquarium |
FAQ
How does the Pincushion Urchin help maintain a reef aquarium?
It effectively grazes on algae and detritus, helping to keep the tank clean and balanced without harming corals or other invertebrates.
What should I feed my Pincushion Urchin if there is no algae available?
Supplement with dried seaweed sheets to ensure proper nutrition.
What is the typical size of the Pincushion Urchin when shipped?
Usually 2 to 3 inches.




Charles Edmunds –
Bought this for my new reef tank. The urchin arrived healthy and quickly started grazing on algae. It looks great and hasn’t caused any issues with corals. Easy to care for and a nice visual addition.
Benjamin Hamilton –
It’s been a few weeks and the urchin is active and eating regularly. I added a small piece of dried seaweed after the tank’s algae was gone. It’s a good fit in the tank and looks natural.
Amelia Oliver –
Perfect for a beginner reef setup. The urchin is active, doesn’t stress other inhabitants, and helps keep the tank clean. I’m happy with the purchase and the size when it arrived.