Dude your shit looks great. If you can keep it between 5.8 and 6.0 your in there don't change what your doing. Hydro PH is on the low side soil is up about 7.5 . Rockwool sucks don't need it don't use it, causes rot but some like it and have good luck with it. There's a nute chart in the faq's that shows what nutes are picked up at what PH level.