Thanks for the informational replies!!! I will try letting my tap water sit out for a while and see what happens. And oh my, eco-complete may seem to raise pH? That's too bad, I was going to call it my near-perfect substrate! I hope that's not the case. But thanks so much for letting me know as I had never heard that before.
I guess if you know your water, you know what you are doing, and you are mindful, there's not much to worry about. I was honestly surprised to see my fish acclimate so well to the conditions of my tanks, they are much more resilient than I expect them to be. Amazing little creatures!
Can living in hard water damage fish that have evolved in very soft acidic environments? I would expect so, perhaps not in a harmful way to the fish but the body must react somehow. Organisms adapt themselves to less-than ideal environments, so what adaptations do our fish implement? I should ask my fish biology professor in class, but I'm curious now!