Auto California Kush

Welcome back to week 3 of this grow diary! Well fuck.. Last week I told you that I suspected the beginning of some sort of interveinal chlorosis that I had to look out for this week. I wasn’t really sure about it until about Day 19 when the symptoms worsened and the California Kush very clearly had some sort of deficiency. I’m not really sure what’s going on but I suspect it’s a magnesium deficiency that’s the only thing making sense to me. I had slight problems with adjusting my watering volume and frequency to this new substrate. I overwatered a bit last week because the substrate apparently has a higher water holding capacity. Immediate actions: Less watering, corrugated cardboard under planters for insulation from cold tiles, checked soil PH (slurry test), ordered Epsom salt (should take about a week to arrive) for foliar application. I’m pondering flushing the substrate so that I can be sure it’s not caused by excess of other nutrients and lockout. But since I noticed that the substrate holds water a little bit to well for my taste this could also backfire and further worsen symptoms. Unsure on how to proceed, guess I’ll have to wait for the Epsom salt and try if a foliar spray improves the status of my plants :( Day 21: A friend brought over a tiny bit of Epsom salt and I applied it with a foliar spray at 4mg/Liter in distilled water. I also started LST to keep my plant as flat as possible. I’m limited by height so a lot of LST is required. I’m using soft green plastic tubing with a metal core for permanent, adjustable things and basic hemp string for temporary things like holding leaves down. Let me know if you have any input on the matter!