Whats wrong with my babies???

Hello there. My babies are now 70 days old 18days into flowering. I am growing with suneshine 4 soil mix, in 4 gallon pots, I am using nutes from General hydroponics floramicro, floragrow and florabloom. I am feeding them once a week watering once as I have done from the start. Right now I am giving 6ml micro, 2.5ml grow, and 10ml of bloom. My ph is sitting at about 6.5 (using powder capsules to test. ph tester doesnt work anymore) strain is white widow. anything else you need to know just ask. the leaves on the bottom are turning yellow and brow and it is spreading up the plants. can someone pleease tell me why???

Anybody???

looks like nute burn to me, but i'm not an expert on that...i have never had that in a plant

looks like overwatering babe

let the soil dry out between watering. i let my soil plants wilt from thirst before giving them a drink....

how often do you water, and how often do you feed?

I water when the soil is dry. the plants ususally start to wilt, and they are 70 days old and overwatering hasnt been a problem so far and I give them less now. I feed once a week and water once a week. the problem started 3 days after I fed so when the soil was dried out I gave them nothing but water and it has only gotten worse. Thanx for the replies

did you change anything give more nutrients more water i started keeping a log on my computer to track changes its helpfull if you figure it out write it down. live and learn i hope the est for you good luck

Here are some better shots of the leaves. I flushed the palnts this morning using ph balance water. I hope that helps. If anyone has other suggestions please let me know. Thanx