One other thing: they did turn the water off in the neighborhood a couple of times recently, but I've changed the water in 6 other tanks w the same water- 2 twice and the others once. All are 50% changes
Yes- probably a bit less, but it's usually 1 or 2 dGH.Does the new water have similar GH to the exchanged tank water?
Water temp is 78-79 and change water about 74What is the temperature of the aquarium and what was the temperature of the water used for the change ?