Asterina starfish - I've had them in all my tanks and they don't appear to harm anything. Mine seem to eat algae off the glass and do multiply like crazy.
Took out over 400 when I finally started to get rid of them. That was a month long process. Still take one out every now and then.
Your's looks like it is one of the darker ones. Those are considered to be the problem ones.
We had pure white ones and darker ones.
Removed all of them.
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