Weird little bugs on rocks

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SeattleReefer

SeattleReefer

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I saw these things swarming my rocks today, anyone know what they are?
20260204_144717_84DDDA64-B463-4CAA-BE66-4A36DD0358AA.png

20260204_144718_8AF607F6-AEB2-4C74-8002-C37343B63EA6.png
 
Saltwater Aquarium

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