When I take the reading for GH using my hot water ( have a water
softener installed) the GH is 6. Using the cold water the GH is 1.
After leaving the hot water to cool the GH is 6. Can anyone explain
this?

Secondly, for the fish I have keyholes, yellow lab. gold ram,
minor tetras, rasporas and corys, should I be using hot water cooled
down when I do the water changes?

TIA,


Larry