Your babies need more magnesium I think. Overall looking good!
Ive found
Gaia Green to be lacking in calcium and magnesium when growing under LED, Ive started to follow a modification of
@Shaded_One reccomendation. He suggests 1 tbsp Gypsum and 1 tbsp Epsom every 2 weeks I believe. Ive been doing 1 tbsp gypsum every 2 weeks and 1 tsp Epsom every week and half or so. LED turns calcium and magnesium into macro nutrients in my opinion.
The galcial rock dust should provide the calcium but I think a bi weekly top dressing of 1 tsp epsom will do your plants good. The signs I see that say magnesium are the yellowing leaves at the bottom with the leaf tip curling up and browning, interveinal chlorosis, and the red/purple petioles.