Gas created in the pipes? I've never heard of that. My water is a pretty similar temp and I haven't noticed any gas in it.Even beyond pH/GH/KH/TDS etc, our local water in the winter is ice cold, 50F on a warm day coming out of the tap, and the gas created in our pipes in the winter months plays havoc with the slime coat of some species of SA fish, such as chocolate cichlids. (H. temporalis) So I no longer keep them either, as I don't have time to store water in vats etc.
Thanks for the article on Hex btw, likely saved hundreds of fish with that one.