Droopy leaves curling down

[gumby420]

Ok im in 10 gal Smart Pots, 50/50 Fox Farm Ocean Forest/Happy Frog. I am in my 8th week of flower( i have another 2-3 weeks until chop). Ive been watering with nutes and have a steady ph of 6.5-6.8. Im watering a gallon each plant every other day.My temps are 73-76 and RH is 45-50%.
Im only seeing it this bad on one plant but definitely starting to notice it slightly on others.
At first i thought it was phosphorus deficiency cause of some dark blotches on the leaves. Now im wondering if it might be either over watering or salt build up?. Any opinions are much appreciated. Sorry for the shitty pictures.

Thanks

 

[paulycali]

Looks to just be from overwatering. Or your spilling some water/nutes on them during watering. I could be wrong though. Let them dry out 75% before watering again. Good luck :)

 

[Mi Grower]

yeah i think thats overwatering my uncle just did that too my plants he used a whole 50 gallon rez on 12 20 gallon pots lol

 

[caligirl]

i'd reduce water and stop nutrients. They need to use up all the nutrients in soil before harvest.

 

[LexLuthor]

Caligirl is right, plain h2o from here on out and maybe a flushing solution if you have one.