Starfish?

[UteMan3431]

Any clue what this is? Just noticed it today. Thought maybe a baby starfish, not sure.

 

[Dcal]

yup asterina

 

[TheDragonsReef]

Theyre a type of pest starfish called astrinas. They mostly eat algae and detritus and arent much harm aside from being able to quickly multiply and overpopulate a tank. Its best to remove them early on before they spread to plague level infestations.