Need a starfish id...

They are too small to get a picture of, but I think I can get a good enough description for you guys to poke a hand at...
The two right now were originally one, so reproduction by splitting in the middle (each peice currently has 3 "legs"). Total of 6 legs when healed, blue/gray in color, and about the size of half a pencil eraser tip. If pics are required i will try to get some when the two halves become wholes again.
 
boo google image search for asterina turned up this

I didn't know they came in blue.. thats exactly what is in my tank, and first page I saw on them lists that they eat coral!! Should I be getting these guys out of my tank!? or was that page wrong?
 
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