small golden brown spots

I'm growing a THC Bomb from http://www.marijuana-seeds.nl/ the plant was growing good for about two months used earth juice grow for all of the vegetative growth i used about 30 ml in one gallon of water i watered the plant every other day i also used a little bit of bat guano dissolved in the watter and a little bit of Epsom salt. the plant was doing fine under flowering. I used earth juice bloom along with a little of the earth juice grow to give it nitrogen. About a couple of weeks ago I started to notice the the yellowing if the leaves and small brown-yellowish almost gold spots and purpling stems the last watering was two days ago and I changed the fertilizers to a solution of 15 ml of fox farms tiger bloom. please some one tell me what wrong withe the plant before it dies.

Your ph is high i would guess and the spots look like over watering or improper drainage. The roots are staying to wet not enough oxygen in the root mass.