Leaves problem i'm not able to identify

[pinocchio87]

[FONT=Arial, Helvetica, sans-serif]Good evening everybody, i'm asking your help because i have a situation that is going on for a few days now, i summarize the whole trip:
- Age: 52 days (7weeks 4days -> 7d seedling -> 45d vegetative)
- Height: 55cm
- Medium: Soil
- Nutrient: Biobizz recommended dosage (see here)
- Light: 150W CFL Agro
- PH: water 6.5 - water+nutrient 7.0 - soil 6.25 (not sure)
- Temperature: around 26/27 degrees
- Humidity: around 70/80%

The problem is that my leaves are sick, i checked out the most symptoms looking here and here with no results

First i checked if it was a nutrient burn (because i have wrongly given my plants Biobizz Bio Grow for 30 days of Vegetative and then switched to Biobizz Recommended dosage).
Then i pruned the plants removing all affected leaves and gave 'em some nutrient and checked all PH.
Today the symptoms appeared again in 2 form, so i think there are multiple problem to be fixed but i can't figure out which are.

I attached 3 photos showing the sick leaves, i hope someone could help me!
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[Erryl.Flynn]

Are you measuring the pH of the runoff by chance?

 

[mack 10]

First and second pic looks like too much p or k.
You said you removed some leafs? How did they look?

How much bio grow where you feeding?

Did you feed grow and bloom or just grow?

 

[pinocchio87]

Thanks a lot for your reply guys. First of all, this is my first try on growing cannabis!

@Erryl I just read about runoff, i never did something like that but i could try, the Soil PH i told you about (6.25), was measured by taking a bit of soil, placed in water for a few minutes and the misured.

@mack10 The leaf i removed shown a P deficency plus there were some lower leaf yellowing and twisting
For the BioGrow things, i made a awful mistake the first 4 weeks, i fed the plants ONLY with 4ml of BioGrow in 1.5Lt of water, i think that's what made the problem, then i found out the Biobizz recommended feeding and i changed right away.


Anyway this are my last update:
I increased the amount of Bio Bloom in my cocktail and fed 2/3 times the babies and now the problem seem to be resolved, i had no more sick leaves for 4 days and the plants start flowering (they probably needed more P cause they were starting flowering???)