Scientific Name: Asterina (specific species unknown)

Fun fact: These are adult sea stars and common pests within tanks. They can reproduce asexually through fissiparous reproduction (fragmentation) and can do this very quickly.

Region: Typically found in warm shallow waters. They are found to hitchhike on plants and rocks to quickly get into aquariums.

Image Credit: Jamie Henderson via Flickr

Information:  https://reefbuilders.com/2016/03/30/asterina-starfish-an-introduction-to-this-common-reef-aquarium-critter/