It looks like soil. If it contains anything other than peat moss and perlite, I would call it soil. Soil prefers 6.5.
However, you should try not ph'ing sometime (maybe not now) and see how that works for you. If you can avoid using a lot of bottles (calmag, etc.), just base fertilizer, you shouldn't have to the water unless your soil ph is off (or doesn't have enough dolomite).