Nutrient Deficiency?

[Burninbowls]

Can someone please help me out and tell me what this is, some sort of nutrient deficiency I assume?

Growing medium:1/2 happy frog, 1/2 earth juice amazon bloom soil+1 cup of earth worm casting top feeding.

Temp:74day/65night

pH was unknown for a while, (that's why I think I have a nutrient deficiency) but is now between 6.2-6.8, I'm not sure of the run off pH

I've been looking around trying to identify the problem but a lot of cannabis deficiencies look similar, I was hoping someone could tell me whats going on!
Thanks for your time and knowledge

 

[c-ray]

my guess is magnesium is needed most, plus a bit of calcium and manganese

 

[Burninbowls]

Thanks a lot for the info, I truly appreciate it! I think i'll foliar feed with some Epsom salt or cal mag.

 

[SeaMaiden]

Epsom salt is MgSO4. There is zero calcium in it. Cal-Mag has what I feel is a poor ratio of Ca to Mg. I suggest getting a separate calcium product and using that in conjunction with the MgSO4.