To much yellowing to quick?

Hello, I got two girls in week 7 from 12/12.
One is a little further along than the other but both are showing yellowing all throughout the plant and then dying off. I know this is a normal process for plants in late flower especially while flushing, but I have not started flushing yet and didn't plan on it for another week or two probably. Im guessing I have about 4 weeks left on the more mature plant but I'll add some pictures and hopefully get an input on that too. Ive been following a feeding schedule for GH flora series and at this point it's just micro, bloom, and hydroguard in the nute juice. Ive been putting ph to 5.5 their whole lives but I just started giving them a little higher ph more around 6.0, (this was after the yellowing was already happening), to let them absorb any nutes they couldn't at the lower ph, hoping this would stop some of the yellowing. Also I'm pretty sure the purpling of the leaves is from my low temps in lights off so I'm not to worried about that. Am I doing something wrong or am I closer to harvest than I thought?

Hoping someone will help soon!

What’s your light and how close is it? All signs look like light burn to me. Leaves pointed up, ends curled and browning.

purple is probably from cool temps. And yes, 4 weeks at least.

Phosphorus deficiency and likely potassium as well.

how much nitrogen do youhave in your feeding nutes

Purple is NOT from temperature. Take it from this Alaskan. It’s phosphorus deficiency.

Overfeeded

So I went back and checked everything over again including re calibrating my ph meter... Well it's definitely some deficiency's. Ph was in the 4's smh. Not sure if I should get a nicer meter or just calibrate this one every 2 weeks. Let's hope the girls still make it to chop and it doesn't hurt yield to much. Thanks for the answers!

hotrodharley said:

Purple is NOT from temperature. Take it from this Alaskan. It’s phosphorus deficiency.

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Thanks for the heads-up I'll have to do some research on that!

Mdaigs said:

So I went back and checked everything over again including re calibrating my ph meter... Well it's definitely some deficiency's. Ph was in the 4's smh. Not sure if I should get a nicer meter or just calibrate this one every 2 weeks. Let's hope the girls still make it to chop and it doesn't hurt yield to much. Thanks for the answers!

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Is it hydro?

Bukvičák said:

Is it hydro?

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Yes, dwc

Mdaigs said:

Yes, dwc

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Well not sure what you’ve done. I have a lot of experience with hydro. Never seen a plant like that unless!! Root rot? If there’s none then drain fill with plain water let that sit 12 hours drain again and fill with your nutes. 1 EC or 500 ppm.

Also I don’t see any mention of calmag??