I'm running 4 NLs right now and 2 are showing heavy signs of a nitrogen deficiency. And it's moving towards the tops of the girls quickly. Someone help. could it be lockout? can nitrogen get locked out? this is my first grow and of course my first def. problem. other than pests. here's some pics of one of my girls, but the other is fairly the same. just seems like an earlier stage than these images. what can I do to fix this in a super soil? anything?