Is this a starfish?

Fockdaddy

Reefing newb
Ok... So I bought some live sand about 3 months ago and put it in my tank. There are a lot of different things happening in my tank. This thing just popped up on the side of my tank. I have no idea how it got there and I had no idea starfish can randomly grow in a tank. If anyone knows what this is please let me know. Thanks.
 

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Yes, it's an asterina. They are generally harmless but some (usually darker ones) have been known to munch on zoas. They all eat coralline off the rocks. I pick them off my glass whenever i can.
 
What about these things.. Anyone know what these are?
 

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