As plants get older/bigger they need more food, and higher concentration. You have at least 2 deficiencies going on. You should be feeding about 2x a week, or at least go up on nutes. Also Calcium and Magnesium, (cal/mag). Cannabis love both of these, and they are a synergistic additive. Also once a week, spray plants with 1 tsp epsom salt/gal of water. (magnesium sulphate). Study up on nutrition a bit, and get those babies back healthy. Pick back bad leaves so you can see if it keeps progressing. Also a little Superthrive will make them feel a little better. It helps with plant stress.
Yeah I thought I should be feeding them more, I do have some superthrive and epsom salt laying around the house, I will try that tonight. Thanks for the help, I do have a grow bible, and have downloaded charts from the web. Even with these helpful guides I always seem to misdiagnose, or over/under address the problem. I swear growing outdoor in Cali was so easy, trying to convert that knowledge into an indoor setup on the east coast seems like such a far gap between the two. T
Always harder indoors. It's about details. Keep a notebook of your observations, and what you do, feed, temps, pH...
It looks like they are not getting enough phosphorus or magnesium. It looks like nitrogen is low too but thay can happen if magnesium is too low. Imcrease phosphorus and magnesium. You dont need to buy a calmag sub and its not a "calmag" deficiency. Your calcium is fine, its only magnesiim you need. Get a bag of epsom salts. No pretty colors or smells, just pure magnesium sulphate. 1 gram per gallon. But thats in hydro though, cut it in half for soil. Usually soil grows dont need extra Ca or Mg but sometimes the combination of genetics, RO water and LED lighting can absolutely make you go through more tha normal. I hope this helps.
They badly need phosohorus and nitrogen. You are in soil and even with RO water the soil should have enough magnesiun. But they need more food
The thing is, when 1 thing gets too deficient it will start causing other problems. For example, magnesium, is the central atom in the chlorophyll molecule. No magnesium = no chlorophyll = no photosynthesis. All of this will APPEAR as a nitrogen deficiency when it is not. Usually with magnesium though the center of the leadlf is dark geeen while the tip and perimeter yellow. Here are 2 pics for you. 1 shows how the plants nutrient requirements change as it grows and the other shows the symptoms of nutrient defs and excesses. The only mistake is that calcium is immobile and it should not be listed under the mobile side.
