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Hal
08/20/2017, 03:59 PM
I'm planning to use an old paintbrush to apply muriatic acid (diluted 8:1 with water) on my dry fish tank glass to remove coralline. I already tried vinegar with only some success.

After I apply the acid, what do I need to do to remove and/or neutralize it? I'm not sure what happens to the acid. Does it evaporate?

I've heard I shouldn't leave the acid on the glass. Why?

I've thought about dusting my glass with baking soda afterwards. Thoughts?

bertoni
08/20/2017, 05:37 PM
A good rinse should be fine. I'd be careful about leaving the acid for a long time on the glass since it might in theory etch it. Google might turn up better information, though. The acid will evaporate over time: it's a dissolved gas.

Hal
08/20/2017, 05:56 PM
Thanks, but I'm pretty sure that muriatic acid does not etch glass.

Hal
08/20/2017, 05:59 PM
I thought about rinsing, but my concern there is that even diluted 100:1 the muriatic acid is still pretty strong. And I don't know that I can dilute it 100:1 anyway. I'm trying to avoid filling and then draining my tank just to remove the acid, but that may be the best solution.

bertoni
08/21/2017, 12:12 AM
Some baking soda will neutralize the acid, if you prefer to use that approach.

kenith
08/22/2017, 04:34 PM
When I overhauled my tank, I used a nice clean sharp razor blade along with some vinegar. I used a wet cloth to remove all remnant shavings.

jda
08/28/2017, 09:34 AM
When outside, I lay a tank down on the side that i am wanting to scrape and pour the Muratic in straight a very little bit at a time. A few bubbles later, the stuff melts off with a long-arm Kent Scraper. I have a hose running all the time - it does not take much water to dilute a few ounces of Muratic to nothing should it hit your skin or clothes for a second or two. Wear some gloves and protect your eyes... keep your mouth closed too.

You can also fill the tank with freshwater and let it sit. In a few days, the coralline will turn white and is a lot easier to scrape off. Most of my tanks are covered in a decade of Coraline and I have taken out pounds of it before after scrapong. The stuff laughs at me when I show it vinegar.

Ron Reefman
08/29/2017, 06:33 AM
I thought about rinsing, but my concern there is that even diluted 100:1 the muriatic acid is still pretty strong. And I don't know that I can dilute it 100:1 anyway. I'm trying to avoid filling and then draining my tank just to remove the acid, but that may be the best solution.

I think muriatic diluted 10:1 is barely stronger than straight vinegar.

bertoni
08/29/2017, 05:02 PM
I'm not sure what the pH of diluted muriatic acid would be, but it is a dissolved gas, and it's worth being very careful with the fumes. It's fundamentally a stronger acid than vinegar.