Unknown critter in tank help

[Ry1]

Hi guys what is this star looking thing in my tank, good or bad?? Thank you guys.

 

[Dw79]

Looks like an asternia star. They are filter feeders. Harmless, but they can multiply.

 

[Oldreefer44]

Asterina Starfish. In small numbers don't hurt anything but can reach huge numbers in a hurry. Like with lots of "critters"
they only reach large numbers if there is lots for them to eat.

 

[Dw79]

Hi guys what is this star looking thing in my tank, good or bad?? Thank you guys.

Sorry, they eat algae. Not filter feed. Still half asleep. Lol