After N tox, now magnesium def?

Hi bro, Your flower doesn't seem to be blooming yet. Try mixing 1 liter of clear water with half a teaspoon of Epsom salt and spraying the plant during its dark period. This may help. Good luck, buddy.

PK def

Looks like calcium deficiency. Mag would show in lower/older growth. I'd hit with cal-mag.

Dude your daytime rh is running 65% rh. Not gonna make it half way through flower at 65 daytime.Cellular respiration happens at night. When temps drop the air has less moisture. So when your lights out, hazard a guess your dropping at least 10F, that 65% rapidly becomes a 75% at night, all night.During night cycle plant spits out moisture as a by product of cell creation.... I like to think of water as the ski lift on a mountain each carriage a transport device for nutrients, water is the carriages. Nutrients are the people. For the plant to process the captured energy during the day, it needs to process it all during the night. In order to optimize this process the air must have enough space to release this water vapor or else production will be greatly hindered. When water cannot exit the plant, less nutrients make it up the stem, more salts in the medium. Over time this builds to ph drift which will appear as nutrient deficiencies. Plants breathe out of stomata, stomata are tiny lungs on back of each and every leaf. These lungs are what spit out the vapor. Unless there is a light breeze to take away that vapor from under the leaf at night the moisture will sit under each leaf and production for each leaf will reduce or stop.RH not kept under control will run havoc in a indoor grow. Stomata start to close above 70% to prevent "drowning" for lack of better term. Akin to asking yourself to go for a jog up to your neck in water, lungs need air. Faster a plant cycles water, faster you uptake water with more nutes. At 65 no water will evaporate from medium, very little being done overnight, less and less as plant develops bigger transpirational footprint.This is in my opinion your root cause. Good luck with the grow, happy new year. 😊

There are no spots coinciding with that chlorosis so i don't think it is Mg-deficiency and the chlorosis is starting at the top of the plant, which isn't quite normal for Mg deficiency, either. useful tidbit even those these plants look old enough, Mg deficiency symptoms in leaves take 30-35+ days from inception of the problem. MEaning the plant has to be defecient for a month before it shows signs of Mg-deficiency in the leaves. - interveinal chlorosis with rust spots starting on middle aged leaves No rust spots at all for Ca-deficiency. Chlorosis is all on new growth it seems... and starting from the central petiole area and out from there as it progresses. Possibly low sulfur. Look for any reddish streaks in your stems -- not leaf petioles! Stem only. that could help confirm. Symptoms are indiscrete, so it is important to cross-reference whatever info you have. Trace elements are possible but very unlikely in soil without a pH problem. If it's low in Fe, i'd never buy that soil again, lol. Trace element deficiency should never be an issue barring nute or ph lockout.. it should exist and be 'enough' under any basic competency of soil constitution. In soilless, at least one part of your fertilizer should contain all that is needed, too.

Ph 6.5, so i guess you are in soil. I found heavy corelation between overwatering and magnesium issues in soil. Sort wet/dry cycle, magnesium will never show up. Thats my view. Flushing in soil brings troubles, sorts almost nothing....

Yes, calcium deficiency and magnesium deficiency. Give cal/mag weekly until plants are showing signs of recovery, then give cal/mag every 10-14 days. Does not look like an iron deficiency to me.

I’d definitely flip them to flower they are gonna get big hope your tent is tall enough. Just wait a week before applying more nutrients then take it easy and slowly up amounts. Remember correct lighting watering and temp/humidity those things will make a plant grow a lot more being correct than adding a bunch of nutrients. Small amounts is enough better to have plants that make it to harvest with small amount of nutrients than burnt plants and have to startbover

The pattern is obviusly trace element I bet is Fe deficiency N have nothing to do with Fe absortion rate, your ph is correct so I will add a little bit of chelated fe (eddha o-o) and will check the TDS or EC of the run off to know if you are over feeding with other primary-secondary elements. Check the ec of the tap water to know if your plant is getting enoug ca/mg, I can see some points that could be a little ca def, but the main yellowness on new shoots are from Fe.