Thanks guys- sounds like my 20% guess might have been a bit aggressive
I'll bring water from the previous residence over to the new one and change it out a couple gallons at a time.
I've lived in the area I am moving to before and unfortunately they buffer the water so additives don't do much of anything. I was keeping much more sensitive fish at the time and an R.O. filter was the only thing that got the pH down significantly. I did try the peat granules though. It changes the color of the water a LOT.
Frankie thanks you all mucho for your advice!