The plant is abot 5 weeks old now.
Im still using 20/4 light schedule.
The reason the plant is so small is Nute burn when it was young and incorrect light spectrum for 3 weeks.
The problem is that some of the leaves are drying up.So bad that they are crumbling away.The leaves are still green so its not nute burn.
I dont know what my humidity is but i reckon the air is too dry.
I was thinking of adding a wet face cloth behind the fan or else spraying the leaves with a mist of water.
Here are some pics