My personal fav are the red orange fromia...they stay small, are relatively hardy and are reef safe...check compatibility with your other livestock...I have had flame angels pick at them!
The Red Starfish, or Red Sea Star, of the genus Fromia may be various shades of red. It has multiple black pores (dots) on its surface. The tips of the arms are the same or a lighter color than the rest of the arm, differentiating it from Fromia indica.
It generally lives alone, but if the aquarium is large enough to support more than one, it will tolerate others of its own species. It requires a mature tank with algae and is generally fairly self-sufficient in the aquarium, finding enough micro-organisms and detritus to scavenge if live rock is present. It is diurnal.
STATS
Care Level: Moderate
Temperament: Peaceful
Reef Compatible: Yes
Water Conditions: 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025
Max. Size: 6"
Color Form: Orange, Red, Tan
Diet: Omnivore
Supplements: Iodine, Trace Elements
Origin: Indonesia, Maldives, Papua New Guinea
Family: Ophidiasteridae