yellow leaves w/ brown spots, tips brown

hello all.

her bottom fan leaves are yellow and its working its up and i just noticed that the very tips are brown and there are little brown spots on them too.
Are the brown spots nute burn possibly?? And the yellow leaves a nitrogen def?
I am flowering now, but this problem i believe was already starting before flowering.
Also the plant has been droopy for about a month and a half. It was from over watering but then i fixed that.She hasnt perked back up since that though.

Sorry bout all this bullshit but im stoned So can any 1 think what this could and how to fix plz gimme some help i cant figure wtf is goin on with her.

Thanks all! happy puffin

i would give here a flush m8
wots the ph and ppm ?

PH is about 7.0 i dont know the ppm tho im currently using FF open sesame for nutes

could be a bit of heatstress man.

as i said m8 i would flush for 24 hrs
as you can see i use hydro so i dont no wot your ph should be but i think its about 6.5