What are these things

StartingATank

Self-Diagnosed Coral Addict
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I have had these in my tank for a long time and they have never worried me, but now they have gotten pretty large so I am wondering what they are. If it helps, I would say they are about 1/4”-1/2” long

20260619_230757_66B104C5-3940-4017-84F1-3347E333EC31.png
 

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