What species is this, harmless?

[e1v4n]

This one came out of my live rock down in sump. Is it a good starfish or does it eat any corals?

 

[bevo5]

Asterina starfish. There are debates on whether or not they're harmful, but the vast majority of people haven't had any issues with them damaging corals - BUT - they reproduce like crazy. They're scavengers and so they'll serve a bit of a positive purpose, but I'd yank 'em out if you get the chance...just so they don't reproduce beyond what you'd want.

 

[Double monti 61]

I love my little stars

 

[e1v4n]

well o well, just bringing out my tweezers

 

[GHOSTLY]

they split but they don't do much eslse