USUALLY, any star that doesn't have knobs or thorns on it's back are reef safe! Stars that are members of the Protreaster, Pentaceraster and Culcita aren't reef safe. Examples are Chocolate Chip, Horned Sea Star, Biscuit, Pin Cushion and Crown-of-Thorns. Stcik with Fromia, Linkia,and Ophiurids(Brittle and Serpent stars).