I know Muriatic is Hydrochloric acid. I use it for eating aluminum and removing the Galvanized coatings of of metals. It will leave a residue and most likely render the tank useless.
Why not just a really diluted vinegar? I would think 5-10g in freshwater would loosen up the coraline after a few days
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Dan Pesonen
Umm, a tank or 5
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