Hello. My well water is very hard. When I top off my tank it causes ph shifts and kills my fish . I lost 6 fish before I figured this out. Thankfully I figured it out before I "murdered" anymore of the poor things! I've actually been keeping fish for several years- very successfully I might add. I recently moved and encountered this hard water issue. When I figured out what was happening, I added some aquarium salt to my tank and, needless to say, have not topped off my tank lately. A week ago was when I figured out the problem and nobody has died since then. (Fingers crossed.) Anyway, I'm pretty certain this is the cause of death for those 6 fish. Here's my issue - Obviously, I'm going to need to add water (for top off soon, and eventually cleaning) and I was wondering what I should do to the water before I add it? Use aquarium salt? If so, how much? Or some other product? I live out in the boonies and have a toddler - I can't realistically purchase water on a regular basis for my tank. I need to be able to treat the water w/ some sort of product or salt/what?? - that I can keep on hand. The fish I have are --- 5 white clouds, 3 catfish, 6 kuli loaches. Once I get this hard water situation under control, I want to add one betta and a few more white clouds (those are the ones I lost). Thanks so much for any help out there - and for reading to my long-winded post.