The Sea Biscuit otherwise known as the Red Heart Urchin is an easy addition to the aquarium. It this very short spines.
| Category | Invertebrate |
| Care Level | Easy |
| Diet | Omnivore |
| Size | Medium 2"-3" |
| Origin | Florida |
| Supplements |
Calcium, Iodine |
| Water Condition | 72-78F, dkh 8-12, PH 8.1-8.4, sg 1.023-1.025 |
| Water Flow | Medium |
| Light | Medium |
| Reef Compatible | Yes |
| Compatibility | See Chart |
The Sea Biscuit, known by the common names cake urchin and red heart urchin, is a large species of sea urchin which lives in shallow waters in the Caribbean. It may reach a diameter of twenty centimeters and is covered in reddish-brown spines.