Can anyone ID this?

[Sgt Jonny Cat]

I know its some kind of star fish, and I assume its good but does anyone have info on it? My tank has been up for over 3 months and he just shws up today??

[krzyphsygy]

Astrea starfish, remove it, Know to eat Zoo's and other corals. If you have a Linkia Starfish it will eat them.

[dmh41532]

looks like an asterina star. I remove them when I see them. Some say they eat corals, but they can quickly take over a tank.