WATER SOFT
There are water softeners available on the market but that really aren't a good option as they only reduce the carbonate hardness without having significant impact of general hardness. They work by replacing the carbonates with sodium so that it no longer shows up on a KH test. This also will more often than not mess up your pH and require you to add back some carbonates to stabilize the situation.
All of that said, unless you are attempting to keep very sensitive fish you are far better off leaving your hardness where it is and the fish will adjust to it. Anything you do to alter hardness (especially carbonate hardness) is going to also impact the pH of the water and you will have to adjust that as well.
You can soften a little buy adding peat moss to the filter or placing driftwood in the tank. There is also a product called blackwater extract that basically does the same thing without the peatmoss on the filter
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