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post #6 of (permalink) Old 01-30-2013, 09:30 AM
Planted Tank Enthusiast
Join Date: Aug 2012
Location: Fremont, CA
Posts: 688
Some rocks will alter your water parameters. The "acid test" (vinegar, muriatic, hydrochloric, whatever) lets you know if the rock will make your water harder (raises pH, contains CaCO3)
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