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No way to know on the asterinas until you catch them eating coral. Sorry, I don't know what the other thing is from the pic or the description. To me it just looks like the red spots are coralline algae on a small bit of rock. A really close up clear pic of it would help, but I know that's not always possible.
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Current Tank Info: 55g softy/LPS tank & 20L reef tank
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