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carbonate hardness
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  1. Beginner Freshwater Aquarium
    Hi So I have a 20 gal aquarium that is currently going through a fishless cycle. It seems to close to done, the nitrites are at 2.0 ppm nitrates are at 160 ppm. I'm using Api's GH and KH Tests and GH seems to be 120 ppm? (7 drops) and KH was 100 ppm? (6 drops). I am wondering if the ppm seems...
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