Help 911 nute deficiency ?

I need help to save my girls. I think I over feed them 2 weeks ago. So I been flushing with water for two week. I know one plant got it good, but the other ones was doing ok. Then I noticed they started turning yellow. I haven’t feed for two week. I really need help to save them.

Looks like your pH was off. Not over feeding. They need pH adjusted nutes, those ones that are brown....are dead. Sry to tell you that. Good luck hope this helps you out. Adjust nutrients to pH 6.8

Classic nitrogen deficiency and possibly over watering. Could be wrong but I doubt it.

Yes yellowing of leaves is due to nitrogen deficiency, but they said they may have over fertilized a couple weeks ago. If that's the case then there is a lock out on nutrients due to the pH being off. Otherwise they'd be green and thriving. Don't add any extra nutes, run with your regular regimen and make sure pH is at a 6.8 .....also make sure your plain water is pH balanced as well. That will lock everything out too. Good luck!!