Help yellow spots

Minime2020

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Noticed this today any ideas any one,
Growing in Coco coir
Canna a and b nutes, ( 5ml of each diluted into 5ltrs of tap water )
1ml of Cal mag added to above solution,
21'c 71%humidty
Water about a 1ltr a day
Found these spots can anyone help, IMG_20201222_182654.jpg
 
@Minime2020

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: PH in the root zone. How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics! Turn off the grow lights.

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

PH in the root zone:

Strain/age:

light used:

Climate:

Additional info:
 
Problem:
Small yellow spots on edge of leaves

Medium/grow method:
Coco coir

Feed: and supplements used:
Coco Canna a and b (5ml of each in 5lt of tap water)
Cal mag (1ml in 5lt of above mix)

water source:
Tap

PH in the root zone:
Unknown at the moment

Strain/age:
Auto jack 2.5 weeks
light used:
Bluple eBay 1000w full spectrum light

Climate:
21'c-22'c
68%-71%
Additional info:
Noticed this yesterday and is only effected on plant,
 
Light cycle is 18 /6
Light height 24" from plant
 
Sorry and i water till run off
 
Why are you adding cal-mag the coco Canna should have plenty it is made for coco.
 
Should I stop the calmag?
 
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