![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)
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 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)