That doesn't sound right. You may want to repost over in the Reef Chemistry forum.
Almost as if the ozone was reacting with something in the water. When you post over there, be sure to describe your current water parameters and source water for mixing water and evaporation top-offs.
All of mine has a brown tint to it now. It has been running for 7 months or so. I've pulled the media out and washed it at one point but the brown it in the media itself.
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