Rain/snow water 15 ppm max, never add cal/mag etc. if you have the space to get that soil alive and enriched, just add water. IMO the canoe leaf is from over watering, check the porousity of your soil or use a moisture meter or the lift method to allow the soil to dry out some between waterings. Some plants will take more water than others in the same media. Every strain and plant has a 'sweet spot'. By all means if you use a straight bagged soil, use water with calcium mag and suphur, like most wellwater around here. Finish your plants, keep and grow the soil. Lots of growers use ff soil as a base on the site.