Sick plant in need of help

Hello, I am a home grower in the first steps of this fine art. I am using 400 watt argo HPS lamp in a very small room and growing 5 plants in total. One of my girls seems to be getting sick, please check the attached pics and tell me what is wrong

Another one has a leaf starting to get yellowish from the center to the edges.

I am using a 4-6-6 NPK liquid fertilizer with trace elements.

welcome to the forum syro.. Your little baby is growing up, if you slap her down, she will rebel. Plants will normally shed some leaves that are no longer needed. Why are you using grow fertilizer for this blooming plant???????? VV

well am I using a wrong fertilizer?

4-6-6 is the only stuff I could get my hands on that has relatively lower N. I used a 6-4-5 one before that and these two are the only ones that contain trace elements.

You see I am not living in a very right geography to gather more specialized products