run

Newbie here! Used to grow in my closet when i was a teenager with cfls and experimented with outdoor grows aswell. Now I am a medical patient and am trying to grow the strongest medicine to help my chronic pain. BIG question is can I grow with HPS/Metal Halide lights in my home? its got fuse...

So my filtered tap water is PH'D at 6.5-7 And when i add 1.5 ML of general hydroponics micro flora it goes to 7 So I've been testing the run off and the past couple of waters runoff been 5.5 - 6 So im wondering does nutrients make the soil acidic over time? and what can i do to raise this...