Two of the seedlings were showing some really marked chlorosis. A little odd, because all 4 buckets should be the same mix, but... I checked the EC of all the buckets and they were consistent. pH was a smidge high on those two, so I dropped it from about 5.8 to closer to 5.4/5.5. After a couple of days, I decided to just remix those two buckets. I didn't want to spend a lot of time trying to fiddle with a nutrient deficiency with autos. After a couple of days the meristem areas were coming in green again, so hopefully it's fixed! The other two plants looked fine.
Edit: Immediately after writing this entry, I was like "Oooh, it's nute burn." so I dumped 1/2 of the reservoirs and replaced with filtered water to get the ppm down. pHed it to 5.5 again, and we'll see!
hang in there. For the most part, these are pretty forgiving plants. After all, it is a weed. I screw up my pH all the time, so I feel ya.
Peace and may your GSC develop some StinkyBudz!