Wtf is happening

Okay I'm about six and a half weeks in about 2 and a half weeks into flower. The lower leaves are turning yellow and dying off. The majority of the fan leaves are turning yellow and even the top of the plant has a yellow tint to it. I was thinking its root bound due to the fact I have to water almost every day and a half. I'm using the fox farm nute trio. Happy frog soil mixed with ffof. I PH my water before every feeding. I use led lights. I can't think of what
Else it could be. Btw the white stuff on the leaves is diatomaceous earth I sprayed on about a month ago to kill gnats it's not spider mites or mold.

im gonna say yr fine. i see a little nute burn, and spotting, so yes, it appears to be lacking something. there is a site specially for plant probs, look, compare, diagnose. every strain is very different, but its very normal to have some yellowing as yr plant matures. looks pretty damn good, those things aside.

Yeah I was thinking it was nitrogen but nitrogen deficiency wouldn't cause those dark brown spots. Thanks for the reply