Starfish, or Sea Stars, are widely known by most people worldwide. They are an incredibly large class at 1,500 living species. They look like a star with a central disk and five arms. Their mouth is located on the underside of their body and their anus is located on top. Most of them are peaceful and reef compatible. Only add other peaceful fish and invertebrates to your tank because aggressive fish will pick at them and likely eat them. Starfish are very picky when it comes to water parameters and will need to be drip line acclimated to your tank.
Sudden changing in oxygen, salinity, and ph can greatly affect the starfish. High levels of nitrate and copper in your tank can be harmful to the Starfish but you can add other trace elements to keep them happy. Starfish are omnivores and will search for plankton, algae, detritus, and other meaty bits they can find in your tank. You can supplement their diet by adding chopped meaty foods like clam, shrimp and squid.
Tank Recommendation (min): 10 Gal
Water Conditions: 76-80° F, dKH 8-12, pH 8.1-8.4, sg 1.020-1.025