Magnesium deficiency or potassium deficiency?

[#1cheesebuds]

Strain is FastBuds auto in 3 gallon soil.
Does this plant have Magnesium deficiency or potassium deficiency? How can i fix the problem.
I feed with 6-12-6 bloom food at a water ph of around 6.3 i let the soil dry before each watering.

I have some cal+mag i could use on the next watering. Would this help any?

 

[luvtogrow]

Probably lockout.

 

[Creeperpark]

What kind of soil mix are you using? What kind of water are you using? What kind of fertilizer are you using? How often are you fertilizing?

 

[#1cheesebuds]

What kind of soil mix are you using? What kind of water are you using? What kind of fertilizer are you using? How often are you fertilizing?

Soil fox farm ocean forest
I use tap water said I then i add the fertilizer then PH Adjust it to around 6.0. Then water the plant.
I feed a low dosage
Ferts is medina has to grow 6-12-6
I think that a three gallon pot still is in big enough for autos.

Also i used the cal+mag in hopes this will help.
What else might I try?