Identifiy the problem

[Zandor]

~800 PPM CalMag + FloraNova Grow
PH @ 5.6-5.8 at all times
-- Skunk #1
-- These are clones under @ a little over two weeks of vegging - I did find algae in the res, so I changed nute solutions last night
-- They are under 18/6 cycle
-- Plants are getting progressively worse as time goes by. This seems to mainly effect the fan leaves...

What does the underside of that leaf look like? Have you looked at it under a 10x to 30x microscope yet?

You may want to do that.