As the title says, I'm in a bit of a pickle! Towards the end of last week, some of the lower leaves on my Auto White Widow started to yellow and die. I thought this was just due to them not getting any light through the canopy. I had visitors over the weekend and couldn't give them any TLC apart from a quick feeding on Sunday and it's spread rather quickly to the rest of the plants. I used bubbled water at ph 6.3 and added half strength bloom nutes, approximately a half tsp of epsom salts and a tsp of molasses. I didn't add any nitrogen or veg nutes. The leaves are pale/lime coloured and the tips of the young leaves are burnt. A LOT of the older leaves have died and fallen off! Is this most likely N deficiency or mag deficiency? They are about 2 weeks into flower. Thanks in advance for any help guys!!!