first time grow - leaf problem

[slayah]

thnx for the tips, by the way the leafs are streaching up, is this a sign of some definecy, or it's because of underwatering ? but I watered them with a cup of water 12 hours ago, so this shouldn't be a problem. oh yeah, I've got some fert, it's N-P-K 3-1.2-2.4 how often should I fert with it ? and what strenght solution ?

[slayah]

by the way, after the fert definecy is solved, do whose yellow leaves and purple stems become green again or do that yellowing etc. just stops to spread ?

[slayah]

another thing, I'm using 23 W 1500 lumen CF, is it enough for now or should I change it to something more powerful ? How many lumens is enough for 1 plant for all vegetative grow ?