I've been mixing my own water with Seachem Equilbrium, Acid Buffer, and Alkaline Buffer added to RO water. I recently learned that the local fish store uses 1/2 Tap and 1/2 RO. I want to switch to that. The water in my aquarium has a higher PH and a higher KH than the new water that is 1/2 Tap and 1/2 RO. Any ideas of how to do this with minimum damage to my plants?