The Red Knob Sea Star requires a large aquarium with ample supplies of live rock. A small specimen will eat algae. As it grows older, however, it is not reef compatible, as it will eat soft corals, sponges, tubeworms, clams, starfish, and other invertebrates. It should not be housed with puffers. It is very sensitive to high levels of copper-based medications and will not tolerate high levels of nitrates.

Breeding in an aquarium is extremely difficult with no distinguishing characteristics to help differentiate males from females.

The Red Knob Sea Star is very intolerant of sudden changes in oxygen levels, salinity and pH of the water, and cannot tolerate copper-based medications. The drip acclimation method is highly recommended for all Sea Stars due to their intolerability to changes in water chemistry. It should never be exposed to air while handling.

In the aquarium, the diet can consist of chopped clams, shrimp, fish, and squid fed once a week.

Approximate Purchase Size: Small: 2" to 4" Medium: 4" to 6" Large: 6" to 8"