FastBuds Banana Purple Punch Auto

Start of week 2. Growing fast. No nutrients added, except a small amount of cal mag pro with sweetner. Used rainwater from water butt, no ph adjustments. Used 'Max Innes multipurpose compost' that was from an old opened bag so the 'outside' biome was working. I am trying to do it as natural as I can. Always had trouble using nutrients and ph adjustments. Only ever had problems with low cal-mag, hence the cal-mag pro added.