spots on fan leaves

Hey dudes, I've been noticing a few spots on some of my plants lower fanleaves. Take a look and tell me what you think, I'm about 6 days into flowering.

Need sum more details like feed n tempss

I use floranova bloom. Using 1/2 strength. Temps are around 80 rh is like 38

Tap water that has sat out a day.

Do you have a pic of the whole plant? Are you feeding enough Nitrogen, you still need to feed veg nutes for the first few weeks of flower to keep those leaves green...

Nope I am not, how should I do that? Do half and half?

I run FNB veg and flower. I also run maxibloom from veg thur flower and have no issues with my leaf yellowing. By the looks of some of those leafs curling you have enough N adding more isnt going to solve your problem. Its really hard for anyone to give you an accurate answer with so little info. A pic or two of the whole plant in natural light would be a big help. What is your base ppm of your water? What are you growing in soil/coco/promix.... Could be a little cal issue, from what I see, looks to be the same thing I get when I need to bump my cal/mg up a bit. If I have been under feed cal/mg thur veg it always shows the first two weeks of flower during the stretch phase.

Heres a few pics of the plant

how big are the pots? look small. roots love fresh soil every few weeks!! soil looks good tho!! here is some thing that might point you in the right direction... https://www.icmag.com/ic/showthread.php?t=231387 or here https://www.icmag.com/ic/showthread.php?t=11688 good luck

Ive never measured my ppm, or ph actually I cpuldnt find any cheap meters. I just have been using tap water that I let sit out over night. One looks fine just the one in the pictures looks ill

cal lockout also look at the leaf curl, poor O2 in the root zone, pH ur water and aerate it first