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Old 10-12-2020, 11:43 AM   #1
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Hard copper colored deposit on glass ????

For the past year I have been developing a hard ( cannot be scratched off with finger nail) deposit on the glass along the gravel line. (see picts). I have researched this online and cannot find a answerer to what it is. Any help would be appreciated. All fish and plants are doing well with no problems.

It's a 50 gal. tank with under gravel filters with power heads and a canister filter outside the tank.

Thanks
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Old 10-17-2020, 07:42 PM   #2
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Come on someone must have some experience with this. I 'm pretty sure its a mineral deposit but from what ?
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Old 10-18-2020, 03:22 AM   #3
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Its algae, try shutting down filter for a bit and squirting h202 in the area. Let it bubble for 16 minutes and do a pwc.
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Old 10-20-2020, 07:24 AM   #4
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Try a razor blade scrapper...

https://www.amazon.com/Stainless-Scr...3193065&sr=8-2
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