UPDATE TIME...
Since getting a tds meter and changing the water last week...
currently using tap water that sits for a few days with bubbles going in it... ppm starts at 104. (Have a RO system coming)
Days since water change... Measurements are taken before making adjustments to ph.
Day1: ppm: 1000, ph: 6
Day2: ppm: 1350, ph: 6.5
Day3: ppm: 1400, ph: 5 (So I added ph up till ph 6.5)
Day4: ppm: 1520, ph: 5.0 (added ph up till ph 6)
Day5: ppm: 1610, ph: 5.5 (added ph up till ph 6)
Day6: ppm: 1660, ph: 4.5 (added ph up till ph 7 - - also added 2 gallon tap water)
Day7: ppm: 1640, ph: 7 (added 1 gallon of fish tank water @ ppm 1040, ph 4.5 and brought the ph down to 6.5)
After a week of adjusting the ph every day... to have the ph stabalize for 24 hr is out of the ordinary. I can't wait till i get the RO system and rid myself of tap water.