Everything I've read says I need to feed the girls more, but I'd like to know more about what is specifically deficient here. Mr. Grow It asked me if the leaves were yellowing from the tip back towards the stem and I have attached some pictures showing exactly that. Is feeding them the proper thing to do? Mr. Grow It also noticed that my timeline was wrong on sprout date. They sprouted on May 4th so I am entering week 7 or week 3 of flowering.

Pic 2

Pic 3

I replied to your other post about this with all the answers to your questions. If you have any other questions, let me know :)
I saw your reply thank you. I thought it was a good subject for a new thread so others can learn from my mistake.
Looks like nutrient deficiency or lock. What is your soil ph?
6.1-6.8 depending on which plant. I shoot for 6.7 on all of them but thats best case scenario. Mr. G thinks deficiency since my PPM drops so much between feeding and watering cycles.
I fed them today a 1/4 dose of FF so we shall see......