[BoomerD]

From Bob Fenner's WWM:
"Much less desirable, but commonly offered and attractive are the "knobbed" Sea Stars, Family Oreasteridae of the genera Protoreastor, Pentaster and Pentaceastor. They are distinguished by having dull spines, bumps or knobbles on their dorsal surfaces, with these often seen in colors that contrast with their overall body pigmentation. Sold under names like Red-Knobbed, Chocolate Chip, and other labels, these species are hardy but aggressive feeders, more than happy to mount and consume sessile clams, oysters and all manner of corals, soft and stony."

Another "Knobby" species, the Chocolate Chip Star, Protoreastor nodosus at a wholesalers and close up in N. Sulawesi. An opportunistic omnivore on other invertebrates. Found widely throughout the tropical Indo-Pacific. Select for smaller 2-3 inch specimens and keep them well fed. "

From MarineDepotLive:
"Diet: Carnivore.
Feeding: It likes to eat Eats meathy bits of seafood and detritus. Also will eat corals, anemones, urchins, crustaceans, small fish and anything else it can catch..
Behavior: The Protoreastor nodosus is generally aggressive toward other tankmates."
This species is hardy but is an aggressive feeder and will be more than happy to mount and consume sessile invertebrates including clams, urchins, oysters, anemones, and all manner of corals (soft and stony). Is also known to prey on sleeping, slow or weak fish. If it can catch it, it will eat it. This species is best kept for eating detritus in fish only systems as this is what it is best suited for."