White things in crevices of powerhead?

Mike N

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Noticed these white things while doing a water change today. Anyone know what they are?
BGatc7x.jpg
 

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.

    Votes: 41 33.1%
  • I occasionally look for signs of invertebrate stress in my reef tank.

    Votes: 28 22.6%
  • I rarely look for signs of invertebrate stress in my reef tank.

    Votes: 24 19.4%
  • I never look for signs of invertebrate stress in my reef tank.

    Votes: 31 25.0%
  • Other.

    Votes: 0 0.0%
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