What is this?

[dawnm]

Can anyone tell me what this is and is it bad?

 

[caseysimp7]

looks like a starfish but i dont knoe if it is harmful

 

[spanko]

Asterina Statfish. Okay unles they get to plague proportions in your tank. Do a google search to compare.

 

[yosemite sam]

Yup, it looks like it's a asterina.