Defenciancy problem please help

[DiscoBayALE]

Ok im 3 weeks.into flower and my fan leaves are hurting...i have this issue every run...my ppm is 1000 to 1100...ph is 5.9 ..i use ph perfect nutes from an..hydro in rockwool..i use r.o water...not sure if its a mag def or nute burn...i use 3 cups of part A AND PART B advanced nutes sensi ph perfect in a 125 gallon ressie per tray.please help

 

[JohnDee]

Hi DB,
Nor sure what that is. What sort of humidity in the room? Plenty of air movement? I'm wondering if it might be one of the many leaf fungi that plague indoor growers.
JD

 

[DiscoBayALE]

Hi DB,
Nor sure what that is. What sort of humidity in the room? Plenty of air movement? I'm wondering if it might be one of the many leaf fungi that plague indoor growers.
JD

Humidity on flower is about 38 percent..yes plenty of air movement

 

[70's natureboy]

Is that leaf in the 3rd pic crispy? Is 1100 ppm's actual ppm's or 50% ppm's? Your humidity is lower than I am used to and the air movement will really dry out the plants and make them drink lots of water/nutes.

 

[hotrodharley]

Looks like phosphorus excess.