What is going wrong???

ok I have a problem with my girls they are in there 4th week of flowering and I have been avoiding the issue but I need your help can you please help a noob out, my guesses are lacking nutrients and over burn from fert I have them in MG I know what your thinking but hey I am a noob and didn't have any other sources for the medium anyway as to my problem please let me know if I can cure them or are they dead?

feed them poor things.

Poor things make subpar food. Feed them rich things.

It's late in that plant's life cycle to make a real difference. But to my eyes that is a poster child for P Deficiency, with probable K and Mg hunger as well. cn

Thanks for the feedback, I was only feeding them there vitamins (ferts) once a week and would water them after 2 days just didn't realize that during flowering the plants are thirsty 24/7 anyway thakns for the replies...

Peace my green head junkies...

It is shit-hot in that grow room and i hope your not using incandescents.