is your tap water pretty hard? If so, normally you don't have to put salt in it. Your water already has several mineral salts (calcium, magnesium, potassium, maybe a tiny bit of sodium chloride) already. All four of those are important for living things.
Also, a few towns, if they have well water, run their municipal water through what is essentially a town sized basement water softener. For every atom of calcium or magnesium they take out while "softening" the water, 2 atoms of sodium are added.
Our municipality does that. I believe they also have another ion exchange which takes out the notorious iron (which deposits stains on white shirts and sinks) and the sulfur which can leave that endearing rotton egg smell. We are grateful that the massive quantities of iron and sulfur are out. However people with blood pressure issues, people with house plants and some aquarists really don't need the additional sodium in the water.
If you draw fish water from the hot water tap and have a water softener, you are also adding sodium to your water. For the most part, I wouldn't recommending using hot tap water (even though it bubbles out chlorine better) because it may also introduce some heavy metals to your fish tank which have gathered in the bottom of your water softener. Most fish don't need very much lead or copper in their water. ;)
Notice that cooks and coffee makers don't draw warm water. Taste is not the only issue.
On the other hand, if you have a couple of teenagers who have just drained the system showering in successive shifts, perhaps the hot water is not too dangerous. ;)
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