Purple short spine pincushion urchin (Pseudoboletia sp.). Look how cool these little guys are! These reef safe grazers are currently a little smaller... | By Salty Revolution | Facebook
![Loving my new short-spine urchin for algae control. Bonus jealous damsel in the background. : r/Aquariums Loving my new short-spine urchin for algae control. Bonus jealous damsel in the background. : r/Aquariums](https://i.redd.it/1e1bnxblomwy.jpg)
Loving my new short-spine urchin for algae control. Bonus jealous damsel in the background. : r/Aquariums
![WTT: Shortspine Urchin, or Rock Burrowing Urchin - Swop Shop - Singapore Reef Club - marine reef fish keeping setup aquarium tank WTT: Shortspine Urchin, or Rock Burrowing Urchin - Swop Shop - Singapore Reef Club - marine reef fish keeping setup aquarium tank](https://www.sgreefclub.com/forum/uploads/monthly_06_2013/post-19639-0-83650500-1372435629_thumb.jpg)
WTT: Shortspine Urchin, or Rock Burrowing Urchin - Swop Shop - Singapore Reef Club - marine reef fish keeping setup aquarium tank
![Purple sea urchin (Sphaerechinus granularis), on reef. Sometimes the short spines are purple, Stock Photo, Picture And Rights Managed Image. Pic. UIG-961-24-KGH00230 | agefotostock Purple sea urchin (Sphaerechinus granularis), on reef. Sometimes the short spines are purple, Stock Photo, Picture And Rights Managed Image. Pic. UIG-961-24-KGH00230 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/b4bfab2163d9ffb2be5951735e047207/uig-961-24-kgh00230.jpg)