The Planted Tank Forum - View Single Post - Using Oil-Dri for cheap substrate?
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Old 09-30-2012, 04:46 PM   #47
Seattle_Aquarist
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Hi celaeno,

No, any residue is not harmful to fish.

STS in a 10 gallon
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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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