plant problems,odd brown color,first grow…any ideas? pics included

this is my first grow,and ive read probably 100 posts dealing with brown and yellow spots but im still not sure whats going on here…any ideas would be greatly appreciated

mag/cal def.......

I was gonna say add cal-mag 10ml per gallon

used cal/mag today…hopefully that was the problem…anybody else have an opinion? thanks in advance

i added cal/mag yesterday…thinking that may be the problem