What is this red color on my rocks

liamelias

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Hey guys, my tank has been setup for a year and a half. I have a big GHA problem but its better than my dinos problem months ago. However a few weeks ago I noticed this redding of the rocks. What is it?

Thanks
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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.

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  • 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.

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  • I have never used a HOB on a saltwater tank.

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