Help I have black spots on my plants

I woke up to black and gray spots on the leaves
Temp is 72* humidity 55% lighting is 800 watts of cfl Ph is fine
I am using Advanced Nutrients Iguana Juice with rain water & pro mix bx
Its only on 2 of 6 plants should I remove the 2 bad plants
This is the first time in all of my 9 years of growing to see any thing like this.
PLEASE HELP

Go on plant problems thread great defiency guide that should more then help

did not help

Phosphorus def mate more seasoned people to comment but my take on it fella

thanks mate