Need some help - Any ideas?

[Serty97]

Can’t seem to diagnose what these brown spots are. It’s spreading somewhat rapidly amongst 2 plants.

soil grow, Mars hydro TS-1000

Any help would be appreciated!

 

[Autodoctor]

Might be heat or to much wind

 

[Bear420]

What are you feeding them, Looks kinda like some kind of nute def.
I've also seen water on the leafs make spots like that but it seems to me somethings missing.
Try a complete NPK bath and wait a few days and see if there's any difference.
I am sure you will be fine.
Good Luck

 

[McShnutz]

Looks like manganese, but I know that it's an immobile element and is taken from newer growth. Potassium would be the next one I'd point to.
I need more info, temps/RH, water pH, substrate composition (or brand), nutrients used (if any), ppm and ideally some pictures of the whole plant(s).

 

[Go go n chill]

Lack of calcium

 

[PopAndSonGrows]

Mild calcium issue IMO.

 

[PopAndSonGrows]

I wouldn't worry about something like this unless it's overwhelmingly everywhere, just a couple leaves usually no big deal, it probably pushed thru whatever it was. ..but if it progresses, then act on it.

 

[blueberrymilkshake]

Mild calcium issue IMO.

I like the new avatar haha