I never saw that out of mine, but then again I only see mine semi annually. I have no clue what that is.
From the article
Ziggy quoted. Doesn't seem to be a spawning event...."Like the majority of other sea stars, the sexes appear to be separate in Linckia, and the animals spawn gametes freely into the water column. Most often, they will hold onto the substrate with the tips of their arms, arch the body high into the water and spray either sperm or eggs into the water above them. If a male and female happen to spawn in close proximity to one another, the fertilized eggs develop into feeding larvae within a couple of days."