Help a newbie

[Minime2020]

Ok so I'm at 5weeks of my first autoflower grow, I have a auto jack and auto ww,
I have had a few issues with pH at first and Ec,
I have a pH pen and Ec now,

Problem,
Slight yellowing of leaf tips,
Some twisting of leaf,
And some random yellow spots,

Growing medium,
Coco coir,

2gal fabric pots,

Nutrients,
Coco a and b, 11ml of each
Rhizotonic, 10ml
Canazym, 13ml
Into 5ltrs of tap water,
I adjust pH after nutes,
I aim for 5.2 and 6.2
I use the canna feed guide
The EC is 0.9 to 1.1
Tent size is 40cm x 40cm x 120cm
Lights ,
Cheap blue red led lights,
600wats
20" from canopy,
Ppfd 560 umols
18hrs on 6hrs off

Temperature is between 18'c and 20'c at lights on
And 16'c to 17'c at lights off
I have a carbon filter and 6" fan

Humidity
65% to 70%

I water till I get 20% run off, about 1ltr each plant ever other day ( not letting the Coco dry out obviously )

I think it might be a mix of things wrong but I don't know what or where to start or how to fix,
Any help or advice would be great
I think I have put as much info but if not just hola,

 

[Arthur]

pH is not a linear measurement... it is measured on a curve like earthquakes. .1 can be a large difference. 5.2 is not ok, 5.8 is the lowest you should go. Most aim for right at 6.0. Check medium pH, if out of bounds, it's coco, so flush with correct pH value nute mix and continue.

Edit:

 

[Minime2020]

pH is not a linear measurement... it is measured on a curve like earthquakes. .1 can be a large difference. 5.2 is not ok, 5.8 is the lowest you should go. Most aim for right at 6.0. Check medium pH, if out of bounds, it's coco, so flush with correct pH value nute mix and continue.

Thanks i will check and see where it is at, I would say most my feeds are aimed at a pH of 6 I think I was ment to put 5.8 to 6.2 but I am pretty baked

 

[Minime2020]

pH is not a linear measurement... it is measured on a curve like earthquakes. .1 can be a large difference. 5.2 is not ok, 5.8 is the lowest you should go. Most aim for right at 6.0. Check medium pH, if out of bounds, it's coco, so flush with correct pH value nute mix and continue.

Edit:View attachment 1274013

IV just tested the pH of the run of in the bottom of the drip tray it's 7.1

 

[Mañ'O'Green]

IV just tested the pH of the run of in the bottom of the drip tray it's 7.1

That is a bit too high. Adjust PH going in to 5.8 for a few feeds then go to 6.0. Your night time temperatures are too low shoot for 20°C night time and 26°C daytime.

 

[Minime2020]

Thanks buddy just mixed up a fresh batch of juice l, and funny enough I got a pH of 5.8 and Ec of 1.0,
Gonna let it sit for a bit then test pH again,,
Thanks for the temperature advice,
Overall what do you think of the girls so far