What is this strange pattern on my rocks?

Saskdevil

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I noticed this strange pattern of stuff on my rocks. I have no idea what it is. I have 2 clowns, an emerald crab, 2 Scarlett hermits, 2 blue dwarf hermits, cerith snails, and a nassarius snail l.
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

  • I regularly look for signs of invertebrate stress in my reef tank.

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  • I rarely look for signs of invertebrate stress in my reef tank.

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  • I never look for signs of invertebrate stress in my reef tank.

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