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Your pH is pretty low dude. 4 is well below where you should be. 5.8-6.5 is the accepted norm. Since your in soilless the questions about your daily ppm readings are not applicable.
Flush your medium with a pH balanced solution. 4-5 times the amount of water to substrate ratio. It will take a little bit of time for your plants to recover, but they'll bounce back after that.
-------------------- Dude she isn't as young as she use to be.
Start using Grow Big and Big Bloom and get some Great White, the roots love it. Maybe a smaller fan to have constant air flow without drying the room out.
ph is low, your light can be brought closer too your plants, 2-4", honestly with fluro's they can almost tuch the bulb, also what is your watering schedule? do you water directly from the tap...if so i would recommed letting the sit in your room 24hrs before watering,,