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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IF EVERY OPTION HELD ROUGHLY THE SAME NUMBER OF GALLONS, WHICH TANK SHAPE WOULD YOU CHOOSE?

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    Votes: 20 28.6%

  • Long and shallow

    Votes: 9 12.9%

  • Cube

    Votes: 6 8.6%

  • Peninsula

    Votes: 14 20.0%

  • Lagoon or extra-wide

    Votes: 12 17.1%

  • Tall display

    Votes: 0 0.0%

  • Dropoff

    Votes: 5 7.1%

  • Bowfront

    Votes: 1 1.4%

  • Hexagon

    Votes: 1 1.4%

  • Cylinder

    Votes: 0 0.0%

  • Fishbowl

    Votes: 1 1.4%

  • Something else (describe it in the comments)

    Votes: 1 1.4%
See comments…

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