I'm guessing it's the well water. You have ppm's but what does the well water start at ? How do you know what's in the well water. I would try R/O or distilled and just some calmag.

We need to know the rez temps too. We just had a cold snap and my bro let the rez temp fall into the 50's and by the next day leaves turn yellow and fell off. I think temps may have gotten lower.

Got to be a diffency. Maybe your well water needs some calmag.
LOC NAR on probation Reviewed by LOC NAR on probation on . leaves curling - got the form done + pics E-indoor or outdoor - indoor E-soil, soilless, coco, aero, or hydroponic - hydro E-specific medium - hydroton CSL-Soil type/brand HCL-Hydro/aero/soilless system type - ebb and grow bucket system w 55g res Rating: 5