Need help with indoor hydroponic tomato.. with pics

[Brian]

Hey my hydroponic tomato looks sickly. What is wrong with it. The light was less then 2 ft away for a while. It is a 400watt metal halide light. The ph is kept at 5.8-6.0.

I usually use about 1 tsp of general hydroponics flora gro per gallon. This is all I use. Should I be using more. For example should I do 1 tsp of flora gro, 1 tsp of flora micro? Mold developed on the rock wool cube so i covered it up with foil.