Just spotted this tonight. What is it?

islandboy73

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It's evening and the tank lights are off. I was walking by and saw the sand-sifting starfish was making his way across the sand so I grabbed the flashlight to take a look. I was looking at the rocks and noticed this for the first time at the base. What is that?
244fb953-2699-4d20-9e0f-6860e95d7785.jpg
 

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