White, fish-smelling, lime-like deposits on aquarium glass - The Planted Tank Forum
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post #1 of 4 (permalink) Old 02-17-2019, 03:52 AM Thread Starter
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White, fish-smelling, lime-like deposits on aquarium glass

As i was doing my routine weekly water changes when i noticed there was a white residue on the glass which stank of fish. At first i thought it to be some kind of algal growth as it was translucent when exposed to water which blurred whatever was behind it in the tank. But now i am a little confused because i looked it up and some say it was a lime deposit but i am curious about that fishy smell. I'd really appreciate it if someone were to know what this was, thanks!
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post #2 of 4 (permalink) Old 02-17-2019, 06:06 AM
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Do they wipe off really easily? I was wondering if it might be the surface scum that sometimes appears on the water surface


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post #3 of 4 (permalink) Old 02-17-2019, 09:38 PM
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I was going to say mineral deposits from water evaporation, but it's probably a combination of that and what Tony said.

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post #4 of 4 (permalink) Old 02-17-2019, 10:36 PM
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While it "could" be lots of different things, water deposits are a really common thing so I would go first for that. If you drain the water down a bit and mix some vinegar in water like 50/50, it may come clean with some wiping. The vinegar is a light acid which does help- to cut mineral deposits as they are mostly alkaline. While vinegar is not too much hazard, don't spill lots of it in the tank as it does lower PH and isn't a really good thing to do.
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