Why are my leaves changing color like this? HELP! PICS 4 YOUR REVIEW

I noticed 2 days ago a single leave turning a bright lime-green (almost white) color. WHY!?! Is it too many nutes. The leaves closest to the stem are lighter and it seems related. What I mean is.... If I take a birds eye view of the plant the center is a lighter green color than those on the outer perimeter, the outer leaves are dark green

This seems to be a problem and I need help with the diagnosis.

look here!

https://www.rollitup.org/marijuana-plant-problems/216537-self-diagnose-your-plants.html

sorry, I cannot see, or tell. my eyes are blurry

sorry, here see if the page helps. It discribs alot of problems with pic's.


http://www.marijuana-seeds.net/Thanks-ThankYou.htm