1st grow Sweet ZZ Auto RQS and Northern Light Auto RQS

I used a humidifier in weeks one and two. I only turned it on for a few minutes and would seal it up for the day. I raised the light and flipped one to 25% and other to 50%. I love having the control of the two lights. My soil is worrying me. I used FFHF primarily and top dressed with FFOF. Very low ph. I think it was at 5.8 when i slurry tested it. I probably stupidly thought that since my hard (330 ppm) tap had a ph of 7.3, it would balance out the 5.8 soil.