Micro Brittle Starfish - Reef Genetics

Micro brittle stars are among the most practical cleanup crew additions for a mature reef tank. Reaching only 1/2 to 1 inch at adulthood, they access spaces that larger invertebrates cannot — deep within live rock channels, under rockwork, and throughout sand beds — consuming detritus, uneaten feed, and organic matter before it can degrade water quality. Their nocturnal habit means they do their work largely out of sight, extending flexible arms at night to sweep particles from the water column and surrounding surfaces.

All micro brittle stars sold by Top Shelf Aquatics are aquacultured in-house through TSA Farm Systems. This production model eliminates the parasite and hitchhiker risk associated with wild-collected specimens and results in animals already conditioned to captive water parameters. Because they are scavengers rather than predators, no dedicated feeding regimen is required in an established reef — they subsist on the organic load already present in the system.

Compatibility is broad. Micro brittle stars are peaceful toward corals, fish, shrimp, snails, and other cleanup crew members. They do not bother sessile invertebrates and pose no risk to a functioning reef community. For hobbyists keeping Bongo Shrimp, they also function as a convenient and renewable live food source. Population growth is gradual, but in stable conditions these stars will reproduce and self-sustain over time.

For meaningful detritus control and long-term colonization, a starting density of 10 individuals per 100 gallons is recommended. They perform best in tanks with ample live rock structure and a stable sand bed. As with all invertebrates, they are sensitive to abrupt swings in salinity or temperature, so acclimation should be done carefully and water parameters kept consistent. Mature systems with established biological filtration are the most suitable environment.