Looking for advice! Bought a used IM 120 gallon AIO tank from LFS. When we got tank, the inside glass was a bit foggy. LFS said fog would go away with water. We added water and things seemed ok until we turned lights on. Fog is definitely still there. This pic seems like where previous owner had his nori clip. Tried scraping it a bit. Nothing seemed to change.
Wondering if anyone knows how to clean it. Tank is newly cycled and I added fish from a smaller tank. Could move the fish back to smaller tank if I need to empty the 120. It would suck, but it will only get harder given more time.
So anyone have tricks to help? Either with water or without? Thanks yall!
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That almost looks more like etched glass or coraline buildup from an old clip spot than something water is going to fix. If scraping did nothing, I would test a small area with vinegar and a razor first, because if it stays foggy it might be in the glass and not on it.