Ive watered twice in the past 4 days with 20% run off and half strength cal-mag to do a flush and see if this works. To me it looks like it could be calcium or magnesium or just a PH ClusterF**K. So looks like were in the same boat. I will do a half strength feeding tomorrow and will let you know what the next couples days of new growth looks like. Shitty part is that I was planning on flipping tomorrow since they've been growing for 8 weeks already. Should I wait to flip until I get this under control?
When I started growing I used GH Flora 3-part and fed heavy. I only got nute burn. No buildup or acidity that I noticed (much). When I switched to Grow More Sea Grow (which has some organic ingredients, unlike 3-part) I fed heavy, didn't see nute burn, thought I was dialed in. And then everything blew up early flower. I thought it was ca/mg def. I thought it was acidic soil.
It took me quite awhile treating various things before I cut my nutes in half, and everything got better.
I thought of that reading your post. It sounds like how I would have described my problem. That's when I discovered runoff ppms. 2500 is where it happens to me. I start taking action when it reaches 2000, and definitely at 2200. I try to stay at 1600-1800 in mid to late flower.
But, your nutrients could be different. The only way to know is to monitor it during a grow and see if you can detect a correlation. I hardly ever measure mine now because I know how strong (and how much runoff) to stay below that accumulation.
