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
 

When to mix up fish meal: When was the last time you tried a different brand of food for your reef?

  • I regularly change the food that I feed to the tank.

    Votes: 37 23.9%
  • I occasionally change the food that I feed to the tank.

    Votes: 52 33.5%
  • I rarely change the food that I feed to the tank.

    Votes: 47 30.3%
  • I never change the food that I feed to the tank.

    Votes: 15 9.7%
  • Other.

    Votes: 4 2.6%
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