Brown Spots on some of my plants leaves, why should I give a f*uck?

Hello,

I have some brown spots on some of the leaves on them. I am growing in a bubbler. I am in day 3 of flowering. My PPM is at 900, and my ph is at 5.8 I figure the nutes are good and don't want to add to over fertilize

Sometimes a few brown spots doesn't mean anything. Got pics?

I will upload some tomorrow. My dumbass didn't think and my 12 hours of darkness is during 12:00 PM to 12:00 AM, and if re did it I would have made the darkness 12:00 AM to 12:00 PM... meh is smart