Thanks for the info I have included a picture of the test the fishery marked it with a pen for me and said as long as it falls between the black lines, your water is good, so Iv had it like this for over 6 months with guppies, maybe I need a better test kit I’m not sure how accurate the test is, if anyone can recommend one? In the mean time I have aquarium salt, would this help? I will order some of the calcium you mentioned, really want to get this right especially for when they go in the new tank when it’s ready. Will Api propper PH 7.5 work if I buy it? I need to know what to buy please we love our fish and like to take care of them so all the advice is gratefully appreciatedGH is the one that affects fish directly. KH can affect tfish indirectly - it stabilises pH so if KH is low, the pH can fall.
If the GH is 120, that must be ppm. It converts to 6.7 dH, and is at the top end of soft water. But the KH is very low - 20 ppm converts to 1 dH.
Despite what test kits say, there is no ideal range for GH and KH. Some fish need hard water, or very hard water, or soft water etc.
Unfortunately, a GH of 120 ppm is a bit too low for guppies; they need a GH of over 200 ppm to be healthy. If you want to stay with them, you will need to 'harden' the water. This can be done by using a form of calcium carbonate in the tank - coral, limestone etc. Or by adding Rift Lake salts to the water. The latter must be added to the new water at every water change at exactly the same amount per litre or gallon to keep the amount in the tank stable.
The other alternative is to let the guppies live out their lives, and get fish which need the same hardness as your tap water.
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