Girl Scout Cookies (Garden of Green)

There's been some solid growth over the last week. Light schedule has been changed to 18/6 and the lights are currently running at 40% roughly 2ft away. I originally had them at ~60% until I noticed dark discoloration on one of the leaves. I'm not sure what it could be, but in case it's light stress I've dimmed the light from 60 to 40%. Hopefully newer leaves won't have discoloration There wasn't a meaningful drop in PPM, which is expected since the roots reach the water just a few days ago. Also means there's no need for additional nutrients this week. I topped it off with a couple of cups of RO water. I plan to use the FIM method to top the plant in a couple of days, just waiting for a few more nodes. My goal is to use FIM and ScrOG to grow it more like a bush than a Christmas tree. I'm expecting a 4-5 week vegetation phase EDIT - Looking into it more, and feel like the brown spots are due to a CalMag deficiency. Could be that I went too light with nutrients the first week. I added 10ml of CALiMAGic this week to help top off last week's light dose.