Nute burn at an EC that low is not likely. I see a lot of people have issues though running low PH. That was one thing I discovered when running coco. When I started maintaining a PH of 6.1-6.3 these issues went away. Your problem is either PH related or its your tap water. My tap water PPM run 125-170 and it KILLS cannabis!
sounds good, thanks for taking the time
Getting a little frustrated and worried since I've been trying my hand at mainlining as well, and I'm running low on fan leaves at this rate so I've been doing some more reading on flushing with autopots. Maybe just flush it since I see signs of nute burn, and restart at EC 1.0 or 1.1 (including starting EC of 0.3, meaning 0.8 EC of actual nutes) with pH 5.8. There was a site I stumbled across another board someone mentioning that autopot coco pH should be around 6.0, wondering if 5.8 could be causing some deficiencies? I was busy chasing what appeared to be cal-mag deficiency problems by adding more and more nutes but looks like a nute burn now.
There seems to be 2 commonly discussed flushing methods for autopots:
1) add pH 5.8 tap water with no nutes/feed for 5 days or so (leaves will turn yellow and some will be sacrificed, risky for me imo)
2) take pots out and flush them with enough pH 5.8 water (probably cant let this water sit for 2 days) about 2-3x the pot size (so about 3x a 5 gallon bucket).
Really wish I can get this dialed in soon