Each order will contain a minimum of 20 Aquilonastra Sea stars.
These sea stars are in the asterinidae family and only reach about 2 cm in size. They reproduce asexually by a process known as fissiparous reproduction. They prefer coarse substrate and rockwork to hide in and feed on coralline,  bacterial (Cyanobacteria) and algal films, as well as detritus and other organic waste. 
They can survive temps as low as 45 degrees Fahrenheit and are a very hardy species that spend most of their time cleaning hard surfaces of waste. 
Sea stars feed by expelling their stomachs (known as eversion); the digestive enzymes that break down food which can irritate and kill coral. We recommend keeping flow high enough in the tank to not allow detritus and other decay to settle on a coral. Buildup can cause starfish to spend too much time in one area and this is when corals begin to get irritated.