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I just test the gh, it took 3 drops to turn green. I 'm not sure how to read this. Using the chart that came with the kit, does that makes my reading 3 dkh and 53.77 ppm gh? Then when i measure the kh, im using the same chart?

So when Im reading fish profile and it says this fish is best kept in 5 to 13 dH, is that the gh or the kh measure?
 

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Each drop added is equal to 17.9ppm so yes 3 dKH is 53.7ppm.

GH is basically how many Calcium and Magnesium ions the water has dissolved in it, Hard water for example is high in Calcium and Magnesium.

Kh OR Calcium Hardness (Alkalinity) is how well your aquarium can maintains its pH level. Low kH tends to mean your water is acidic, where as high is soft.

Yes you use the same chart but it is what the result means which is important.
 
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