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I was checking out the bins of rocks at my local Big Als and there was a sign that said Tufa / Tuffa rock is only for reef and Cichlid tanks. Why is this?
I suppose that is why my GH strip reading is like 300 pph after mixing tap with distilled for so long. My PH seems about neutral though. I have 2 in my 29 gallon non cichlid tank. I didn't know what they were before I bought them heh