Talking about the species, I have 3.
1. Just grey = innocent
2. Grey with a red dot in center of the upper side. Eating coral.
3. Dark grey. Eating coral.
I take out every 2 or 3 directly as i see them and then inspect the tank for more. I dont mind the 1. It takes a bit of looking because I only see the colors on the upper side.
I think this is a fair assessment of the risks asterinas do/don't pose. I will add to it:
If they have a blue tint: they are eating your Tubbs zoas
If they have a green tint: they are eating your Rasta zoas
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