Right now I am using Eco-earth which I don't see as being very beneficial to the plants once so ever. Its basically just dirt w/o fertilizer or anything. What would be a good substrate to use that would be benefitial to the plants -OR- is there some kind of tablet or liquid you can get that would aid plants/ be beneficial? My plants are just looking boring right now, not much growth within a long period of time, no color.

EDIT: I am using exo terra 50w compact bulbs (2) in a canopy.