hey guys, one of my plants is getting yellow tips at the top of the plant. Grown in soil and perlite, 4 weeks into veg using canna terra veg. watering every 4 days with a little fert. under 125w cfl then i will blast it with 600w hps for flowering. whats causing the yellow tips?
![IMGP0132.jpg](/data/attachments/1654/1654374-57b8b984302104498426e2a9058e614d.jpg)