Hello! My Wappa seedling is 2 and a half weeks old, do you also think she's a bit pale? Soil is just coco coir (60%) and vermiculite (40%), gets 5 hours of sun (early morning/late afternoon) and I only water with root juice once every 3, 4 days.
Hola en mi opinión debes transplantar a un macetero un poco mas grande y cubrir con sustrato todo el tallo y fertilizar con un abono rico en nitrógeno y veras como seguirá creciendo super fuerte! Buen trabajo amigo!
You need to transplant this seeedling asap, a half filled cup is barely enough room for more than 3-4 days of root growth.
Root juice is not a fertilizer, so you will need to buy proper cannabis grow nutrients and flowering nutrients too.