Gitz21
You didn't mention if this is a show tank or set up for breeding, most fish adapt to various water conditions.Using RO water mixed with your well water lowers the TDS which is great if your breeding.The above responces as to water consistancy is indeed important for happy fish.
Water changes are a lot easier to do when your tanks are the same as your well water.
Except for my breeders all my tanks get direct water changes from my well,with the temp adjusted through a mixer valve.
Oh my Ph is 8.2 and Tds 280 from my well.
You should test your PH by taking water straight from your well to get a reading them aireate 24 hrs and retest to see how stable it remains. HTH