What is this spider thing on my glass

MantisShrimpMan

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While looking at my tank, I thought I noticed a crack. Upon closer inspection the lines I thought were a crack belonged to some sort of organism sitting on the glass, and while there’s only one or two big enough to be easily seen, a more thorough inspection revealed there were at least a dozen more.

I’m hoping it’s just copepods or some other friendly critter but something tells me it’s gonna be a pest. Praying it isn’t aiptasia tho. They kinda look like you asked a 3 year old to draw a spider, and they’re about the size of a pinhead.

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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 25.2%
  • I don’t currently use a HOB filter on my reef tank, but I have in the past.

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  • I have used a HOB on fish only or quarantine tanks, but not on the display tank.

    Votes: 53 23.9%
  • I have never used a HOB on a saltwater tank.

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  • Other.

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