First indoor grow, second overall

Mg

Hey 👋 I do agree, you are over feeding… I found a page with most popular deficiencies & methods to help… more specific: I guess you are lacking iron due to to much nutrients in your soil. Maybe following link will help: https://sensiseeds.com/de/blog/wie-man-die-sieben-haufigsten-defizite-von-cannabispflanzen-anhand-von-blattsymptomen-erkennt/ Hope this helped 👊🍀

Hey Growmie, From the looks of that new growth turning yellow (starting at the tips and spreading), it seems like you're dealing with a nutrient issue, but not from underfeeding, more likely over-fertilization or a pH imbalance causing nutrient lockout. What’s likely going on: Nutrient Burn: The fact that it got worse after upping the feed is a strong sign you're overfeeding. Burn usually starts at the tips and creeps inward. pH Lockout: If your pH is off (especially too high), your plant can’t absorb key micronutrients like iron or zinc , even if they're present. Iron Deficiency Symptoms: Yellowing new leaves with green veins is classic, and again, often caused by pH issues, not a lack of iron itself. What you should do: Flush with clean, pH-balanced water (6.0–6.5 if you’re in soil) to clear out excess salts. Check your runoff pH if it’s out of range, that’s probably the root cause. Ease off the nutes for a few days and monitor. Next feed, go with 1/4 to 1/2 strength max. Make sure your temps and airflow are on point. Environmental stress can make it worse.You’re doing the right thing by observing and adjusting, just gotta dial it in. Keep a close eye on the new growth over the next few days; it’ll tell you if you're back on track. Happy growing!

Oh looks a bit high to me. In combination with purple stems on fan leaves this could be the start of a lock-out. Try to lover your ph a little and see if it gets worse or not. If they start curling up it’s most likely from too much light. Good luck 🍀👍 👊

Looks to me like burning, slightly over fed. might need to lower the EC just a tad and or get more runoff. About 15% of the pots volume should do. water in slowly as not to create water paths where it just flows though and does not soak in. Some plants get purple coloration, I find indoors a lot of my plants do. I think its part of the light spectrum/source I use "LED". I have tried dosing with Mg and S as it is said this is a sign of them element lacking but that is not the case. PH is on point for me. others may think its to high, EC does seem a bit high to me, I'd prob knock that down to 1.4-1.6 but If it can handle it then maybe it likes more. CANNA makes good products from my understanding, I have yet to use them myself but heard heat things about them, I do use their substrate coir bricks. a+

Plant uptake nutrients in two ways, passively through flow of water by osmosis or actively through the use of energy (ATP). Generally when we see tips go dark it's a sign that the plant is suffering from osmotic stress. The mineral content (salt within the plant is of higher ec than ec in soil) osmosis is the flow of water in the direction of highest salinity. (Saltiness). So now we know the plant is not passively uptaking calcium and most uptake will now have to switch to active transport. In order for plant to switch and utilize fully to active transport it becomes highly dependant on oxygen to supply root respiration in order to create enough energy to do so. Purple anywhere on stems is linked to Phosphorus, which is strongly linked to oxygen uptake in the range of 6.5-7 if your ph is outside of this range Phosphorus will prefer to bind with iron or something else. Flower is critical time in thay plant will spit far more carbon into the soil, around 40% of all carbon it captures is fed to soil to feed the microorganisms, this will make the medium far more moisture retaining, if topsoil is compressed enough it can create a moisture retaining layer restriciting oxygen. These micros scavenge large amounts on oxygen, leaving the plant possible needing more. As soon as a soil runs out everything will switch from aerobic to anerobic. Nothing good ever comes from a soil thay lacks oxygen.