White Residue on Rocks?

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Addicted2Acro

Addicted2Acro

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I came back into the office this morning and saw there is some kind of white buildup on some of my rocks that formed over the weekend. Have never seen this before. Any idea what it could be? Screenshot 2025-07-28 at 9.24.10 AM.png
 

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Do you have photos of your tank? video isn't loading on my end
 

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