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Old 02-20-2013, 07:29 PM   #29
Seattle_Aquarist
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Hi binbin9,

If you picked up those stones at a Asian store in Kent there is a very good chance they are a calcium based stone. I find that they do effect the hardness and to some extent the PH in my tanks.

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45 Gallon Tall; 96 Watt AH Supply CF; 6700K; & 30 Gallon Long; 2X36 Watt AH Supply CF; Press. CO2; UGF; Heat Treated Montmorillonite Clay
Greater Seattle Aquarium Society (GSAS)

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