wtf is wrong with my fan leafs help please

im in my 3rd week of flowering and just noticed these brown and white spots on a few of my fan leafs help please im thinking its a ph issue im growing in soil and using fox farm nute my temps stay around 79-81 with lights on and 70-73 with lights off humidity is 37-45% with lights on and and not sure what the night humidity is

ergh..

whats the PH levels?
have you checked thoroughly for insects (including under leaves?)

i'm no pro but it looks like some sort of mould to me!

yeah i checked the ph this morning the soil was 6.2 and the runoff was 5.3 thinking that might be my problem so do i need to flush my soil and i havent noticed any bugs will but will check throughly whe the lights come on

you growing in soil? try and keep the ph at 6.5 or just above. i use potassium hydroxide at little amounts: e.g. i fill up a 3L coke bottle with water for my feed, and check the ph before adjusting it.. i use a 1ML syringe and measure out 0.1ML at a time and keep checking the PH so i know for future how many ml to add to the 3L of feed!

^ just incase you didnt already know lol.

i would be careful that it isnt mould though, it looks grey to me.. and i dont know of any plant problem off the top of my head other than mould/mildew. if anyone more experienced comes on this thread then im sure they can add their thought on it!

yeah im using ffof soil thanks for the help im going to fix the ph of the soil tonight

to me it looks like a low ph

yeah just check my soil its ph is 5.4 not good at all what can i use to flush just lots oh plain water?

I would flush with ph balanced water (7.0). That means distilled.