What is ideal GH for goldfish pond


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Good morning from MN. Curious, what is ideal GH for goldfish pond? I have plants and shubunkins in 850 gallon pond
 
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This is from the FAO publication “SmallScale Aquaponics Food Production, Integrated fish and plant farming”
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Not specific to goldfish, but a University of NM aquaponics publication says,

“Water Hardness
Water hardness is a measure of positively charged ions, particularly calcium (Ca2+) and magnesium (Mg2+). To- tal hardness is the sum of the concentration of Ca2+ and Mg2+, as expressed in ppm calcium carbonate (CaCO3). Hardness can range from soft (0–75 ppm) to very hard (>300 ppm). Dissolved calcium in the water aids in os- moregulation and relieves stress in fish. Levels should be maintained between 50 and 100 ppm.”
 
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To me, KH is much more important and I don't even check for GH. The few times I have tested for it over the years, it's normally close to the same number as the KH in my pond.
 
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Hard is good. I keep the KH in my pond at around 200 ppm. My filters work best at that level and that much KH keeps the pH very stable.
 
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