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Hey all, I am currently cycling my 75 gallon tank. I have pool filter sand for my substrate, water from the tap has ph 8, kh 5 degrees and gh is 9. What is the best way to get my hardness up without raising my ph?
 

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Hi and Welcome to C-F!!

Before deciding to adjust your hardness or any other parameters, leave a sample of your tap water out in a clean glass container for 24 hours and then test the pH, KH and GH again. Sometimes those values can change after the tap water has a chance to off gas after being exposed to air for 24 hours.
 
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