Very unhappy girl

[Mr Green Fingers]

MC1, my PH has worked between 5.8-6.5. Usually above 6. I used to run 5.8/5.9 but no longer chase that. My tap has a PH of 8 with 300 ppm. MC2 and MC1 are basically the same but just different ratios. I’ve been told people use less with 2.
FB

Thanks FB, actually I just took the decision to change back to my other nutes, just cant seem to get the MC 2 dialled in and have never had an issue with phosphorus in veg and plus the MC seems to block up my airstones pretty good as doesn't seem to fully dissolve, will give it another shot at some point but need to get this poorly girl back on track if I can

 

[Mr Green Fingers]

-- Sure looks like severe P defc., which is odd as hell!... what's the res' T? Only other thing I can think of is a bad infection... I'm not sure I've encountered a funky pheno' that was P "challenged",... If she stays shaky, might be wise to cut your losses,....
Definitely not B defc, that's immobile and always hits the uppermost leaves first and worst,...

Hey @Waira do you definitely think this is a deficiency and not an excess? If a deficiency should I add a little PK 13/14 as still spreading?

 

[Waira]

Thanks Waira! Res temps sit at 68F, it seems to have slowed down somewhat as 1 set of leaves has managed to survive longer then 48 hours
New growth looks decent and all the nodes have started growing now so I will give her a few days to see if I've got on top it, am loathed to pull her as I grow in a small space and she is 1 of 2 so cant afford to lose 50% of my potential crop!
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that's good news! it might be she's just a nute bitchy pheno' this is actually pretty common,.... I've had some that were super weak with Fe and Zn uptake, battled it for weeks before I got ahead of the curve,... her pot mate never even blinked, so I know it was a pheno' thing!
... it's not a toxicity thing, that I'm certain of, no other co-symptoms that would show for sure at such levels to cause this damage so rapidly, persistently... The appearance looks very much like P defc., maybe some pH hiccups triggered it... MC is a bit thin in P, IMO.... You can slip a weak dose of PK booster in and see it this helps....

 

[Mr Green Fingers]

that's good news! it might be she's just a nute bitchy pheno' this is actually pretty common,.... I've had some that were super weak with Fe and Zn uptake, battled it for weeks before I got ahead of the curve,... her pot mate never even blinked, so I know it was a pheno' thing!
... it's not a toxicity thing, that I'm certain of, no other co-symptoms that would show for sure at such levels to cause this damage so rapidly, persistently... The appearance looks very much like P defc., maybe some pH hiccups triggered it... MC is a bit thin in P, IMO.... You can slip a weak dose of PK booster in and see it this helps....
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Thank you! I added a little PK 13/14 a couple days ago, that combined with the change of nutes seems to have perked both ladies up, hopefully I'm back on track now!

 

[Waira]

nice catch mate! ....right then, carry on....

 

[Mr Green Fingers]

nice catch mate! ....right then, carry on....

Hey Waira, need some more advise
I cant seem to shift this phosphorus deficiency for good, hasn't slowed growth but still getting the spotting, purple stems and yellow tips but the res has been getting 1ml/l of PK 13/14 since you diagnosed it so should I up it?
Problem is I am having to drop the dosage of my base nutes to keep ppm's down.