Glueberry Auto flower

Week 2 & they are 2 inches tall. They have been fed only ph water with root nutrients & a drop or two of cal mag, all from advanced nutrients, I’m not watering directly next to the stalk I’m avoiding it and just doing a circle around the plant. About 1 inch away. Help them roots search for their food. We are currently running 18/6 light schedule. Growing in a mix of coco coir & perlite 60/40 ratio, I have a controlled temp of 26c day & 20c dark. Running a 400w sodium light . That’s about it for now.