Leaves curving down but leaf edges cupping up?

[ELRooster]

Has anyone experienced this before? Thanks

 

[tyler.durden]

Doesn't look like any burn going on with your tips, may be excessive heat. What's the temp and humidity in there?

 

[superstoner1]

Looks like heat and a possible ph issue.

 

[ELRooster]

My temp is running between 75-78 and humidity is at 40. My PH has been dropping to about 5.5-5.6 and I bring it back to 5.8-5.9. PPM is at 1600.

 

[superstoner1]

Cut the nutes to around 1000 and what is res temp?

 

[ELRooster]

Water temp is 69, I have had the nutes lower in the past but then I get opposite cupping because of magnesium deficiency. These are in 4th week of flower and 4 feet tall.

 

[70's natureboy]

I think they look pretty good. They look like they are about maxed out on nutes though. I think you could cut it back just little

 

[thedumbguy]

heat prolly

 

[superstoner1]

Water temp is 69, I have had the nutes lower in the past but then I get opposite cupping because of magnesium deficiency. These are in 4th week of flower and 4 feet tall.

Then lower nutes and add epsom salts.

 

[ELRooster]

I think I will try the epsom salt I have heard that might work. The only other thing I can think of doing is instead of flushing every 7 days Is try and flush every 5 days so I can lower PPM but they would get a fresh load of nutes more frequently. Thanks for the replies

 

[ELRooster]

Flushed the system and took a few more pics.