Lower leaf issues, +REP

Strain: Hawaiian Kush
Age: 23 days
PH 7.2 (Will correct when I get more PH down)
Nutes: 'Suggardaddy" (5ml/gal) and 'ROOT 66' (5ml/gal)
Res: 2 gallons, water temp is constant ~75deg
Watering: 1 minute every 3 hours (about 75ml every time)
Temp: around 80, does get to 90 a couple times a week

I'm growing this along side some Nirvana Bubbleicious, and only the biggest is showing slight yellowing on the lowest node. All of the Hawaiian Kush is showing leaf damage like this on its lowest node, getting about 50% worse every day. Other leafs look OK.
All plants show slight root burn with new growth.

I'm thinking its some kind of deficiency, Mag or Phos, but I have no clue so I hope someone can help me!

Might be the start of a P def.

Fix the pH problem and the problem will probably go away.

Doctor Cannabis said:

Might be the start of a P def.

Fix the pH problem and the problem will probably go away.

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I'll get on that and see what happens. How long should it take to recover/stop getting worse?

2-4 days should do it.

You think I should start veg nutes because of the P def? Haven't yet and they are 17-26 days old, 4-5" tall.
Thx for the replies.

It's really important that you have correct ph in hydro. Adding nutes won't do you any good with 7.2 ph. You can use distilled vinegar as ph down in a pinch. Works fine. I would get that ph taken care of and go with a 500-700 ppm veg nute feed. You need to start feeding pretty early in hydro.

westmn said:

You think I should start veg nutes because of the P def? Haven't yet and they are 17-26 days old, 4-5" tall.
Thx for the replies.

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That ph level will lockout nutes. I would wait for the ph level to down because it would be useless to give them nutes right now

Yeah, fix the pH and then start adding flowering nutes (they have more P).

Doctor Cannabis said:

Yeah, fix the pH and then start adding flowering nutes (they have more P).

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It looks exactly like a phosphorous deficiency.

Thx for the info, I'll get that PH down to 6, add the correct nutes
And I haven't taken the temp of the water but I check it right before lights out (when its the hottest) and it feels cool, 70-75deg I would guess, same as just before lights on.

So they seem to be recovering, some of that black along the edges is fading back to green, thanks guys hope this keeps up

westmn said:

So they seem to be recovering, some of that black along the edges is fading back to green, thanks guys hope this keeps up

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They look GREAT.