Amnesia Trance Auto Fem Newbie Needing Advise

[Best Try]

I have 10 amnesia Trance auto-fem in a 3 x 3 tent under a 600 watt HPS w/ excellent ventilation in ff of soil. I am about 3 weeks into flowering and the tallest plants are turning bright yellow...anyone know what this issue could be? Please help.

 

[str8smokn]

She need nutes would be my first thought.
What's the flower time that the breeder gave you?
So she should be about 6 weeks old.?so you should have about 4 more weeks roughly.i would feed her some bloom nutes.
STR8

 

[Best Try]

I gave them some Happy Frog Bulb Food yesterday (rated at 3-8-8) I guess I will have to wait and see if it works.