Brown Spots

[UTR420]

Hey guys, im a month into flower and my girls is getting a good amt. of brown spots on the top leave around cola, what is the reason for this? nute burn? i have it in w. 2 diff kinds of miracle gro soil that have nutes in n i use schultz 10-15-10 drops every now n then.. i think its becuz of the soil..but figured id ask..thnx 4 help

 

[legalize_freedom]

got any pics? could be a number of things, what is your ph?