Amnesia 8 weeks in flower - Brown spots on leaves

[Bong6900]

Hey guys
my amnesia started to show some small brown spots on the fan leafs 2 weeks ago and now its getting worse i have change res. every week and got 3 air stones in res. im ofcourse growing in hydro with leca

Ec. 1.6
Ph. 5.8

Look at my journal for more pics.

 

[2clean]

Same prob here

 

[HealingKronic]

looks like you need to add calmag to your next watering

 

[2clean]

Coming from a guy that's a winner of the month. I will not argue. Running to store now. How much should I add? I'm getting Calmag plus.

 

[HealingKronic]

simply follow the recommended dosage on the bottle. if you are growing organic you can use glacial rock dust instead