Starfish. Good or bad?

[BestMomEver]

So sorry for the picture quality, but can anyone tell me what kind of starfish this is? Is it good or bad?

 

[DSC reef]

Asterina starfish. Some are good members while others are known to eat coral like zoas. There's so many species it's impossible to identify the good from the bad. We had the bad ones unfortunately and if you have one there's 20 more you dont know about. At least those seem to be grazing algae.

 

[FMF0331]

Looks like asterina star, i have them in my tank . Never like them, so i remove them whenever possible.. they ate some of my zoanthids .
Other hobbyist say they're harmless.

 

[BestMomEver]

Hmmmm.... only ever seen them on the glass and rock, but this is an SPS dominant tank. There are very few zoas. I will watch them. Thanks!

Elizabeth