Nutrient Deficiency? What is the solution to such a Problem?

[ZeppelinBaked]

I have a plant that is 7 Weeks old, going on 8 and was perfectly healthy up until about a week ago. I started to notice some copper coloured, yellowing on the older fan leaves at first but it seems to be spreading toward the top of the plant, and has been progressing slowing through the week. At first I thought I over fed, so I skipped 2 feedings, but it's just gotten worse so I figure it's a calcium deficiency, but i'm not quite sure. It's the first plant i've ever grown, so i really need some feedback as to how to handle the situation. Anyone have any suggestions?

THE BEAUTY^^^^^

 

[skirbec]

bugs-

 

[datrippp]

whats the ph.. If its a ca mg defficiency, give a good dose of calmag, or MagiCal...