Can somebody ID this growing on my filtration in sump

JamesCTID

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Bottom of the filter block you can see the orb looking thing. They are all over my filtration. Hopefully these are fine and they only seem to grow in my sump.

Any help would be great TIA!

1000021858.jpg
 

Crabs McJones

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agree with tubeworms and pineapple sponges. common sump dwellers
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

  • I currently use a HOB filter on my reef tank.

    Votes: 56 24.5%
  • I don’t currently use a HOB filter on my reef tank, but I have in the past.

    Votes: 59 25.8%
  • I have used a HOB on fish only or quarantine tanks, but not on the display tank.

    Votes: 56 24.5%
  • I have never used a HOB on a saltwater tank.

    Votes: 54 23.6%
  • Other.

    Votes: 4 1.7%
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