Can anyone identify this?

Happy Frog soil with Subcools Supersoil
RO water
Ph 6.5

All of my plants are doing this, they reach roughly week 4 of 12/12 and Bud growth halts/leaves start dying. At first I thought my PH was off, i tried 6.5 - 7.0. Same results.
I then thought my SS was too hot, so I tried straight HF on two lollipopped plants with light feeding, again, same results. I am absolutely baffled at this. I have seen excellent results from other growers whom have cuts of the same plant with no issues.
I've now switched to Roots and seeing if HF is the culprit.

Any temp spikes recently? Aslo how long has it been since you calibrated the meter? I think the ph is too low and has been for some time. If you have green leaves before flipping and keep watching ph this wont happen. I think its Cal/Mg lockout from low PH.

You shouldn't be phing your RO water. RO water has such a low ph buffer ability because it's 0-5 ppm of total dissolved solids. In any organic soil, the plants roots and the soil controls the ph. Your ph balancing should be done before you cook (compost) your soil. As for what the problem is in your leaf coloration, I'm not sure.

text book cal mag deficiency

They are supposed to do that..it is taking Nutes from the leaves and absorbing them into the buds...From personal grow exp..I wouldn't care about the leaves...but if you are worried..feed them a nute with more P....and actually..."yellowing leaves" is a good sign your buds are taking in the nutes leaving your leaves to yellow.

Also..to me..Looks like Nitrogen....do you smoke cigarettes in the room?..sounds silly..but I had that problem in an enclosed space where Cigarette smoke caused an issue.

I believe you don't have enough nutrients amended into your soil and the plant has exhausted what is in there! Super soil? Are you adding any teas to your waterings? Not cal/mag as you can see fading in the entire leaf evenly! Also always ph your water if you can it always helps to provide what the plant needs at around 6.5 then less buffer work for your soil! Good luck!

Also if you can avoid leaf yellowing,(which is the plant sucking the chlorophyll out o the leaves) which I believe is seeking nitrogen! Most of the posts here on your thread are inaccurate with the exception of *buds* post! Be careful for ba info always research what someone suggests before diving in! U probably already know that being around here for so long! K I'm done

*BUDS said:

Any temp spikes recently? Aslo how long has it been since you calibrated the meter? I think the ph is too low and has been for some time. If you have green leaves before flipping and keep watching ph this wont happen. I think its cal/Mg lockout from low PH.

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No temp spikes recently, it stays between 70-74 degrees. PH meter is calibrated regularly, it's a blue lab.

The plants are beautiful and green with no def. in veg, week 4 hits and they start degrading.

actont said:

They are supposed to do that..it is taking Nutes from the leaves and absorbing them into the buds...From personal grow exp..I wouldn't care about the leaves...but if you are worried..feed them a nute with more P....and actually..."yellowing leaves" is a good sign your buds are taking in the nutes leaving your leaves to yellow.

Also..to me..Looks like Nitrogen

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This is some bad info right here, NOBODY listen to this shit!

chewberto said:

I believe you don't have enough nutrients amended into your soil and the plant has exhausted what is in there! Super soil? Are you adding any teas to your waterings? Not cal/mag as you can see fading in the entire leaf evenly! Also always ph your water if you can it always helps to provide what the plant needs at around 6.5 then less buffer work for your soil! Good luck!

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My SS was amended a little stronger than Sub recommended, a little more here and there. I've even tried 50-60% SS, still the same effects. More than likely not the issue. No teas, just straight water with a little cal/mag every once in a while.