PH levels have been pretty stable around 5.8 lately. The growth speaks for itself and I'm extremely impressed by the VIPAR SPECTRA XS2000 lights. Keeps the heat very low and humidity right. I have it at 50% power because I started to see VENOM show light stress. These are STRONG lights. The girls are also starting to drink a ton more water.. will need to flush before flowering next week. one more week of Veg