Sea urchins are omnivores, and their diet depends on the species.
Primary Foods
- Macroalgae: Caulerpa, Ulva (sea lettuce), Gracilaria, and Sargassum
- Microalgae: Phytoplankton as a supplement
Other Foods
- Fish flakes, shrimp pellets, frozen brine shrimp, zooplankton, and calcium-rich foods like crushed coral
Research your specific species, provide variety, feed once or twice daily, and remove uneaten food to maintain water quality.