Using BioCanna and following chart, getting yellow spots all over fan leaves

I'm on my 6th grow with BioTerra plus soil, BioCanna nutes, following the feeding chart to the letter. I don't think I've ever seen this before, but my girls are acquiring ugly yellow spots on their fans leaves as soon as bud production starts in flowering...WTF? I've reduced the amount of nutes because I thought I was burning them, but it's not going away.

Anytime I start seeing any sort of spots I double check my Ph. Soil and Run-Off and also maybe throw a dose of CalMg in there.

are you doing any kind of foliar feeding or spraying for bugs with your lights on? could be burn spots from the lights, you wouldnt beleive how much damage can be caused by spraying your plants while under direct light.. Im assuming your growing indoors but you didnt specify. same rule applies for outdoors though, dnt spray them with anything if the suns out or you'll girls be cover in spots

just noticed you said its your 6th grow so u probably know all that by now but just incase.....

a pic would help. have you looked under the leaves to see if anyone is living there? you need a magnifying glass or a loop. Circuit city has a small 30x for 15.99 well worth it. If not bugs than get some Calmag and give them .5ml per liter. Sounds like a deficiency.

Rule #1 Stuff starts to go sideways with the health of your plants flush with 10% nutrients 90% water till you get lots of runoff.

Hummmmmmm spots from water on the leaves when the lights are on??????????? Think about it a bit........ when it rains and the sun is out after do all the fruit and vegetables get spots, do cows get burn spots from the drops of rain, do people at the beach, I think you know where this is going,

It's an old school tale. Not true.

Peace and positive vibes to all

not an old school tale. cows and people are far different from pot plants, spray a plant under a 1000 W hps and see if it doesnt leave burn spots. The dropplets magnify the light much like a magnifying glass would, works the same under the sun as well. No point in arguing though, I learned my lesson from first hand experience.

two words my friend, downey mildew, its the elephant in this thread no one wants to mention, if its sporadic yellowing, its not nutrient toxicity/deficiency normally

Finally found signs of unwelcome visitors on the underside of some leaves, tiny black specks, about 2 per leaf...and some even tinier white shit...sprayed everything with TakeDown Garden spray, even the soil...hope I got them all. Could that have been causing yellow blotches and spots? Little shits.