I’ve been using a 125w cfl it’s about 10 inch high but I’ve got mars hydro st1000 today. Temp is 22c lowest 28-29c highest. I’ve been using canna a and b with canna coco pro plus 7ml/10Litre humidity is 30-45
Plant to young for nutrients I have marshydro 1000 great light also have 2000tsl make sure your pla t is far away from marshydro and maybe it heat stress from CFL to close or the nutrients to strong drop nutrients to 350 ppm for seedlings and clones when babies they are fragile