OK, it DOES have added nutrients. Even tho it says "lightly", there is usually enough nutrients for at least the first two months without adding any more.
I looked at the General Hydroponics website, and I don't know what to tell you about them. I do know that they don't give any NPK values for any of their products that I could see. They sound kinda like the movie Idiocrasy to me.."Use Brawndo. It's got what plants want. It's got electrolytes".
You really need to learn how to use a product based on it's NPK value rather than a "Cake Mix Recipe". In order to be a successful grower of anything, you need to understand plant nutrition, and if you are gonna grow organically you need to have a good basic knowledge of soil structure and soil micro-biology as well. True organic growing is really quite easy, and very forgiving for the beginner, but there IS a learning curve.
It would seem that you have fallen victim to the hyped up marketing of the MJ nutrient companies. Just because it SAYS organic on the label, doesn't mean it is. Everything I use in my garden (when I buy anything) comes from a mainstream nursery or nutrient company, not a "Hydroponics" company.
But back to the issue at hand, that soil looks OK, you just over fed them. When it comes to growing, less is more. You'd rather have them just a bit on the hungry side than over fed.