Help! Red stem.

In flowering. Stems are red. Was using wrong feed sched. w/ Botanicare line. Got the right one now. Looks like their 2-3 weeks in flower. But it's been about 5-6. Dosed 30mL of blm/ 12mL of karma. Should give more? Or less more often? Or more more often?

http://www.marijuana-seeds.net/Thanks-ThankYou.htm

Try going there... this page helps in identifying problems before its too late! I think you want to go there and scroll down to the part about (P) Phosphorus