What's wrong with my plant?

[signul]

Hey guys im almost 8 weeks into my first grow. I have 6 auto flower NYC diesel. They're in fox farm ocean forest. No nutes till the 5th week. On week 5, I started slowly with fox farm grow big. That's when I started to notice the Browning. It's progressively gotten worse since then. I've tried diatomaceous earth because I read fox farm comes with pests. All water has been thru a filter and ph'd to 6 to 6.5. Light schedule is 20/4 with 2 Marshydro300 and 1 600. Temperature is 75 to 80. Humidity is 40 to 50. I can't figure out what the hell this one plants problem is. The rest seem ok to me. Please help! Thanks

Ps first pic is the Browning leaves, second is of my setup.

 

[KingJoe83]

Hey guys im almost 8 weeks into my first grow. I have 6 auto flower NYC diesel. They're in fox farm ocean forest. No nutes till the 5th week. On week 5, I started slowly with fox farm grow big. That's when I started to notice the Browning. It's progressively gotten worse since then. I've tried diatomaceous earth because I read fox farm comes with pests. All water has been thru a filter and ph'd to 6 to 6.5. Light schedule is 20/4 with 2 Marshydro300 and 1 600. Temperature is 75 to 80. Humidity is 40 to 50. I can't figured out what the help this one plants problem is lol. The rest seem ok to me. Please help! Thanks

Ps first pic is the Browning leaves, second is of my setup.

Up your cal mag bud Under led lights cal mag is crucial but that also looks like gear heat or light burn as well hmm second opinion fir sure here

 

[AnimaSola]

The left half of the room with the tacoing leaves could be showing mite damage. A pic with the grow lights off would help with a diagnosis.

 

[signul]

Sorry guys

Originally I thought it was phos deficiency but it doesn't seem to be getting any better. I just took these pics, I cut a lot of the dead leaves off so it looks actually better than it did.

 

[zSaber]

Mine is also doing the same thing i'm pretty sure it's a calcium deficiency I drained buckets and it seems to do a little bit better just try adding some cal mag

 

[MrCanada]

PH is off and you most likely have a salt build up. I would flush 5L of PHd water per Gallon of pot size.

 

[signul]

Thanks guys I'll try that!