Confusion with symptoms

[ver151set]

Hey guys, hoping for a bit of advice.

NLxBB in 3.9 gallon autopot with coir and QB288v2 260w turned way down, currently 26k lux at canopy.

Im using megacrop and calmag, currently feeding 3.2 grams per gallon of Mc, 1 gram of sweet candy and 150 ppm of calimagic using ro water phed to 6. Alll new versions of greenleaf except I switched from Calmagpro to calimagic to eliminate the extra nitrogen
Temps and humidity are good 77 degrees and 50-60% humidity.

My entire grow Ive had yellow tips that never seemed to progress and get worse. Now im seeing some signs that lead me to think Im deficient in things and read most people using 4-5 grams per gallon of mc in the 3-4th week while im sitting here in week 5 barely over 3 grams.. Ive nervous to up dosage due a little bit of clawing in a few leaves. I also have lots of purple stems, not sure why with 150ppm of calimagic so either Quantum boards and I need more or genetic but not sure which.

Some of the lower leaves which had yellow tips now have spots on tips and a tiny bit on the edges

Anyway Im hoping you guys can take a look at the plant and tell me your thoughts on my feed strength ~ Thanks a bunch

 

[HonestGR]

Generally the tips burning is a sign of too many nutrients. (Nutrient Burn)

However yellowing can be caused by deficiencies as well.

Your water schedual, do you flush between feedings? In coco you can have salt buildups and other issues arrise if you dont.

Also how far is your light from the canopy?

Just a few extra questions

 

[Simplicio]

Hey guys, hoping for a bit of advice.

NLxBB in 3.9 gallon autopot with coir and QB288v2 260w turned way down, currently 26k lux at canopy.

Im using megacrop and calmag, currently feeding 3.2 grams per gallon of Mc, 1 gram of sweet candy and 150 ppm of calimagic using ro water phed to 6. Alll new versions of greenleaf except I switched from Calmagpro to calimagic to eliminate the extra nitrogen
Temps and humidity are good 77 degrees and 50-60% humidity.

My entire grow Ive had yellow tips that never seemed to progress and get worse. Now im seeing some signs that lead me to think Im deficient in things and read most people using 4-5 grams per gallon of mc in the 3-4th week while im sitting here in week 5 barely over 3 grams.. Ive nervous to up dosage due a little bit of clawing in a few leaves. I also have lots of purple stems, not sure why with 150ppm of calimagic so either Quantum boards and I need more or genetic but not sure which.

Some of the lower leaves which had yellow tips now have spots on tips and a tiny bit on the edges

Anyway Im hoping you guys can take a look at the plant and tell me your thoughts on my feed strength ~ Thanks a bunch
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I'm using Megacrop 1.0 in DWC, for which 1 g in 1 gallon produces a ppm500 of 125.
If MC 2.0 produces the same ppm, then your total ppm looks to be around 550.
I use a bit less than the 3.2 g you do, nothing else except a little CalMag already figured in ppm, and get leaves that look like yours if I go much above 400 ppm.
I also need to reduce nutes a bit a few weeks from harvest.
I've grown strains from seed to harvest without ever going above 350 ppm.
I believe our plants do better when we don't stress them by overfeeding.

 

[Arthur]

Was the coco flushed and precharged? Have seen similar issues from unflushed coco. High salt content right from the start.

 

[ver151set]

I dont flush since they are in autopots, its autowaters. Lights are 20" but dimmed way back to 25k lux. Qb288v2 260w 3000k.

Coco wasn't flushed as it was the canna stuff that says its preflushed and buffered. I did precharge it with 2 gr per gallon mc and 2ml per gallon calimagic.

For my res last res made 3 days ago I lowered the feed to 1.5 ml/g calimagic -153 ppm
3.2g/g mc which brought it to 594 ppm
1g/g sweet candy which brought it to 738

The res before that was 2 gallons and she drank it in 3 days, difference was that res was using 3.5g/g mc and 1g/g calmagpro instead of calimagic. I felt like I might have saw a little clawing so I backed it off.

This is starting with ro water, and measuring with calibrated apera tds meter set for a 0.5 conversion

Maybe I'm overfeeding? I've read many complete journals to try and learn and prevent failures and I'm feeding less than almost everyone I've seen, especially in week 5. Then again I feel like I may see deficiencies but honestly I'm just winging it and going by what I read. No experience just trying to follow others paths for now, and I saw charts here showing many using 4 grams mc starting in week 3-4. But my last attempt was dwc and it never went above 400 ppm

 

[Mañ'O'Green]

How are you checking your PH is it possible the gauge is off? The only time I had a problem that was persistent for the entire grow it was a bad PH pen. I went with BlueLab and have not had a problem like that since. I replace them yearly and maintain them regularly.