Great tip for hydro growing:
PPM's go up, PH goes down: Plants require less nutes.
PPM's go down, PH goes up = Plants require more nutes.
PPM's stable, PH goes up = Equilibrium (Ideal)
PPM's go up, PH goes down: Plants require less nutes.
PPM's go down, PH goes up = Plants require more nutes.
PPM's stable, PH goes up = Equilibrium (Ideal)