Flush before transplant and if it's soil, don't choke it with nutes, with soil only feed every couple of weeks and be careful with organic soil additives. Nute requirements vary quite a bit, my OG kush is very nitrogen sensitive and a little goes a very long way, never feed it above 700 ppm in coco coir. A buddy got a sativa in veg and the thing drinks 1200 ppm and wants more! Don't believe the directions on a three part cut it down for most indica dominate, but it varies with strain and phenotype (individual). They wanna sell more nutes start with half strength.
LED lighting and coco coir/ 30% perlite with air pruning pots works great with a hand feeding with 20% runoff. 2 day feed and 1 flush with calmag and if ya want silicate, repeat. good flush once or twice not too much though. Make sure of your ph! ph is very important for nute balance and up take, see the link I posted before. If yer using organic nute supplementation it can drop the ph too. Looks like a ph issue to me and maybe over feeding. Better to under feed and proceed with caution. Leaf tip burn is a sure sign yer too ambitious. High intensity LED lighting and high temps can exacerbate existing imbalances cause of rapid plant metabolism.
