Simplest?....don't worry about it.
Unless you are keeping ';wild caught'; fish that are sensitive to a set range you don't need to concern yourself as all common species (even African cichlids and Discus from opposite extremes on hardness) are tank-raised and farmed in water chemistry far removed from their country cousins and extremely adaptable to what comes out of a wide array of faucets.STABILITY of water chemistry is more important than jacking around for an ';ideal perfection';.... and stability comes from routine water changes (which you should be doing anyway,right?).
';I was thinking about water hardness for my fish ....'; .I take that to mean they are already in there,so a little late to think about it,eh? If they are doing fine,and you are doing a proper water change routine,then no reason to worry with it.How does water hardness change?
yes they will change over time due to many factors, to raise kh which is related to gh i believe, u can make a solution of baking soda(or powder whichever comes in the yellow box) and water and add that. if u want to lower ur ph use regular baking soda if u dont want to lower ph; bake the baking powder first for about an hour at 300f. ur tank will change all values over time depending on what u do to it, the best thing to do is test ur water and buy a buffer to raise the ph if need be
Please please please do not use baking soda in your fish tank. This is what is used for humane fish euthanasia = dead fish!
I can't help with gH or kH, but pH will go down as Alkalinity is raised, and vice versa. There are chemicals available, and cichlid sands, if you're looking for a higher pH.
As for hardness, I generally make the water softer by adding salt. Most city water is already plenty hard.
pouring concrete mix in the water should help to harden it
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