Huh? There's a whole sticky of plant problems with pictures and solutions in the infirmary...am I missing the point?
then you didnt read it did you heres a tid bit from that linkI can't speak for him, but I believe the "this guy" you're referring to, meant this thread (and I could find no mention of MG):
“The Complete guide to Sick Plants,pH, and Pest troubles!,” by MynameStitch
https://www.icmag.com/ic/showthread.php?t=11688
GL!
Good site with some graphics to show what to look for
http://www.mmjshopping.com/cannabis-college.php