Just curious, but why are you concerned about messing with your pH? Is it for the livebearers? All my aquariums run in the range your's is testing at and the fish are fine. I don't keep livebearers though, just acid loving fish.
When you tested the tapwater did you let it sit out for 24 hours? That will give you a better reading than straight from the tap. If you already did that and 6.4 was the result, then no amount of daily water changes are going to get you to 7.0 pH.
Adding the Stresscoat directly to the tank is fine.
When you tested the tapwater did you let it sit out for 24 hours? That will give you a better reading than straight from the tap. If you already did that and 6.4 was the result, then no amount of daily water changes are going to get you to 7.0 pH.
Adding the Stresscoat directly to the tank is fine.
