Well water or city? You have to be careful of chloramines in any water change with municipal water, highly toxic. And temperate changes shouldn't be too quick. Better to do a 40-50% change one day, then another one in a day or so than all at once. If you have the time, of course.
I have city water. I use a de-clorinator/water conditioner when I add tap water. I also use the Barley Extract as needed.
