Hi everyone! So recently I brought a Corsair 4000x(white) and now I want to buy some new fans for "better cooling" (since corsair ones pretty much stay off since I don't have a fan controller nor the necessary pins on my motherboard to turn them on) And I've decided I'll use artic fans(p12/14,F12) since they can daisy chain,but I'm a noob working with fans and I have three questions : 1- Is my airflow planing good? Or how can I improve 2- Can I mix pst fans mixing 120mm and 140mm together? Or should I use a fan controller 3 - should I go with black or white? I'm afraid black won't mix with the white and gray but they are cheaper where I live

Just for curiosity sake my Build of dubious quality CPU - >! R5 3350g !< MB - >! Asus prime A520M-E !< RAM - 16GB DDR4 CL14 GPU - >! R7 360 2GB !< PSU - >! Pcyes spark 400w sfx !< Case - Corsair 4000x

I know I should upgrade other stuff first but my last case was literally found in the trash and I wanna leave cpu/gpu for last sine they are more expensive and Im planing or buying an kyber 750w Psu from XPG next month