Originally Posted by Rabbi
Ok I'll try to grab and post some photos tonight sometime. It's honesty rather embarrassing lol. Feeling like amateur hour over here.
That's K from too high a Ph.
Calcium doesn't concentrate on the edges like that. You have burning as K regulates transpiration
Originally Posted by RockinRobot
Any updated pics?
Only other suggestion would be not let your PH drift quite so high. 6.1 max on hydro for me. I usually readjust down to 5.6 or 5.7 as soon as it hits 6.0, but I never let it get above 6.1. I think 6.5 in hydro is a bit high.
My money is still on the CO2 though.
I'm not sure of the hydro system in use, but the figures look usable in a recirculated environment.
I would mix up some 5.4 Rabbi
If your using calmag because of this problem, it will displace more K from the substrate. You need the calcium and magnesium to move on, to give the K somewhere to hang. Obviously this isn't applicable to DWC. It's a cec issue with coco and expanded clay