Spots on my leaves... WTF? please help

well i noticed these brown on my leaves. I am using growbig and superthrive. Only 2 drops of superthrive and the nessecary amount of growbig. We are also checking the PH of the water. and we have a air pump in the water. but that's it... nothing else with the water.

here is sum pics. Is it nute burn? or lack of nutes? or heat stress? I turned up the fans today.

here is my other thread that I created... it has pics of the entire system.

https://www.rollitup.org/indoor-growing/130231-stealth-cabinet-first-grow-hydro.html

let me know if u need any more

please help!

i did notice sum water on the TOP of sum leaves also... but I have NO IDEA where that water came from. All the water that we have in the box is the reservoir. But its on top of the leaves and the reservoir is below it.

weird

looks like in one pic you may have a little powdery mildew

Lookin like P or K def to me unless ur temps are high, which i'm guessin they were since u weres ayin u turned the fans up. What's the temps? If ur temps are under control, then its def. a nute def.

marc413 said:

looks like in one pic you may have a little powdery mildew

Click to expand...

what would I do about the mildew?

am i missing a nute?