yeah red stems is a deficiancy. i would guess that if you gave it nitrogen that would go away, because when i gave nitrogen to my plant that had light light green leaves and some red stems here and there its leaves got big and dark green and its stems lost all red. but i gave it an egg. sounds weird to crack an egg into your plants soil but it works, ive been doing it since my girl was a teen and now its flowering and its healthy. i used to give them like once a week..now its like once every 2 weeks