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Asterina only bugged my zoas, never seen any eaten,,, but they do make them unhappy and stay closed for a period of time?
No some types will happily graze on zoanthids. I had a large rock covered in a so so green zoanthid, I liked the Asterina so much I just let it munch until all the zoanthids were gone.

Any asterina starfish,,, they all look the same to me, bit of colour??? Who cares! It's garbage for the home aquarist, unless you study them for some strange reason
I do not get rid of bristle worms either, diversity in my tank makes me happy. If a hitch-hiker is not chomping on my corals or eating my fish it can stay no matter how ugly it is.
As for Asterina, there are hundreds of different types, even marine biologist have difficulty telling one type from the other. Generalization can be made but not with any certainty. You can not take into account the invert that becomes an opportunistic feeder in the absence of it's routine food type.
Good link:
Reefkeeping Magazine - Reefkeeping 101
I do not get rid of bristle worms either, diversity in my tank makes me happy. If a hitch-hiker is not chomping on my corals or eating my fish it can stay no matter how ugly it is.
As for Asterina, there are hundreds of different types, even marine biologist have difficulty telling one type from the other. Generalization can be made but not with any certainty. You can not take into account the invert that becomes an opportunistic feeder in the absence of it's routine food type.
Good link:
Reefkeeping Magazine - Reefkeeping 101

