New grower needs some help

[Crustybuds]

Hi folks, this is my first grow and I have driven in some problems..
Problem: upper leaves started to yellowing from the veins, lower leaves have some brown spots

Medium/grow method: biobizz all mix

Feed: and supplements used: ph 6. 2- 6.8 RO bottled water. After I noticed yellowing in the veins I gave little bit cal mag 0.5ml/L (advanced nutrients) but that stayed the same. Two days after I gave little bit more 1ml/l cal mag and 0.5 bloom ( as she started to flower one week ago)

water source: ro bottled water
Strain/age: strain unknown autoflower its a beginning of 4th week

light used: Cob CXB3590 200w

Climate: varies from 22 to 28C. No air circulation, poor equipment. Only exhaust fan

Additional info: rest of the plants are doing fine.

 

[Crustybuds]

Any thoughts?
Should I give a larger dose of cal mag? Or maybe I should flush her good. And later stick with recomendent feeding chart? Because i don't have a feeding routine yet

 

[VRZ711]

varies from 22 to 28C. No air circulation

no fan or air circulation lowers calcium intake and creates this classic symptoms of cal mag deficiency, for now use a fan to blow soft air on top on the cannopy.

if you have added cal mag then wait for it to take effect.
feed at 1/4 recommended dose and go up bit by bit until 1/2, as you dont want to over feed an auto flower.
best of luck.

 

[Crustybuds]

no fan or air circulation lowers calcium intake and creates this classic symptoms of cal mag deficiency, for now use a fan to blow soft air on top on the cannopy.

if you have added cal mag then wait for it to take effect.
feed at 1/4 recommended dose and go up bit by bit until 1/2, as you dont want to over feed an auto flower.
best of luck.

Thanks mate, I'm heading to the shop then