deficientcy

Hey there. Looking at a group of 4 Thai sticks. Two of them are showing signs of a deficientcy. I'm running GO line, full nute schedule, pH on point at around 6, 18/6 light schedule on 340 watts of 2,700k CFLs, they are 5 weeks old, black gold potting soil with 30% perlite, air pots, was...