waterdrop
Enthusiastic "Re-Beginner"
Ruby,
When hardness (either GH or KH) is in mg/l (equiv to ppm for our purposes) then you divide by 17.9 to get the measurement into german degrees of hardness.
So, for instance, a GH of 120ppm is 6.7 degrees.
A reading of KH=40ppm is KH=2.2 degrees (KH below 4 is very soft and pH will be expected to drop soon).
Remember, only KH is used as an "action item" to help you predict pH crashes.
Your tap water GH is 80, so you have some calcium coming in when you do water change, which is great, that's all you'll ever need as far has having some calcium in there I think, especially as far as providing some for the bacteria.
Your tap water KH, however, is quite soft, so this will bear some watching and discussion.
~~waterdrop~~
When hardness (either GH or KH) is in mg/l (equiv to ppm for our purposes) then you divide by 17.9 to get the measurement into german degrees of hardness.
So, for instance, a GH of 120ppm is 6.7 degrees.
A reading of KH=40ppm is KH=2.2 degrees (KH below 4 is very soft and pH will be expected to drop soon).
Remember, only KH is used as an "action item" to help you predict pH crashes.
Your tap water GH is 80, so you have some calcium coming in when you do water change, which is great, that's all you'll ever need as far has having some calcium in there I think, especially as far as providing some for the bacteria.
Your tap water KH, however, is quite soft, so this will bear some watching and discussion.
~~waterdrop~~