Dying/yellowing/thin new growth.

I got this one out of 88 that is dying on some new growth.
Growing in BM7
Temp: 72-79 during full cycles, Hum: 45-50%, Floor temp 75-79
Nutes: Bontanicare Pro, just switched to TigerBloom (3 days into flower)
Water every 2-3 days depending on pot weight.
Lights: HLG v2's: readings at 400-550 upol at the canopy.
I suspected a PH imbalance. I PH my water tank to 6.4ish after adding nutes. I filled my tank with my well water (7.4ish PH) and flushed this one and the runoff read 5.74. I kept flushing till it hit around 6.5. What causes ph to drop if I'm feeding a PH mix with nutes at 6.5 every other watering and then 7.4 with plain well water on the every other waterings? Am I on the right path?

Watch this, it has helped me simplify plant issues

Your pH is off for sure...hence the distorted growth. Out of curiosity, why did you choose the BM7 when they have a cannabis specific mix? Regardless, this mix is mostly Peat, which is acidic to begin with. This is most likely why you see your pH drop. Not knowing much more about your medium, I would say you need to get a handle on your pH or you're in for a disappointing run. If you only switched lights 3 days ago, you may want to reconsider until you get your plants sorted, or it's only going to be more of a pronounced problem as you go.

CannaCountry said:

Your pH is off for sure...hence the distorted growth. Out of curiosity, why did you choose the BM7 when they have a cannabis specific mix? Regardless, this mix is mostly Peat, which is acidic to begin with. This is most likely why you see your pH drop. Not knowing much more about your medium, I would say you need to get a handle on your pH or you're in for a disappointing run. If you only switched lights 3 days ago, you may want to reconsider until you get your plants sorted, or it's only going to be more of a pronounced problem as you go.

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Well, we are in a fresh State to legalize medical, and finding 100+ bags of FoxFarm was impossible, and I needed to get a move on. I have a good friend who owns a large nursery, and has been using BM7 for years recommended it. He told me it comes in right around 6.5 PH. Overall, the rest of the crop is doing good in it, and this one plant out of 88 is struggling. And even then, its just a couple of flower sites in this shape. I was just curious what would drop the PH when im putting 6.5 mix, and 7.4 water in the inventory.

Capn-Crunch said:

Watch this, it has helped me simplify plant issues

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Good watch Capn!.. Thanks!