Yes, PH I have made sure to be at 6.0 .. It was 5.8 for a day and then I got it back to 6.0 to 6.2...
PPM has been 1000 to 1600.
The humidity was the biggest problem on this run. It got as low as 20% for about a week till I got it under control.
Could there be a virus or infection in the room? Or a fungus perhaps?