Organic grow based on Subcool's Super Soil recipe. Plants are about 3 weeks out from germination. Two Granddaddy Purp and one Purple OG #18. Room temp mid 70's with humidity in the 50's. Lighting is a Platinum P300 LED in Veg mode. Water is RO with CalMag added. PH probably a bit high(a little over 7?). Just using aquarium ph test kit because my POS Milwaukee PH55 went tits up again.(Recommendations for a better ph pen always appreciated) Just within the past couple of days I've noticed that one of my GDP's has developed spots/patches that are turning dry and brittle/crispy. The other GDP and Purple OG have not shown any signs of this issue. I'm stumped. I've never seen anything like this before. Anyone seen this before?