The only thing bad with top soil is that you could introduce pests that you can not see. I am going out on a limb here, but if you take the nute filled soil and flush the crap out of it... busting all the nute balls you can... and use a TDS meter to determine if you are actually flushing out the nutes and go from there. Make sure there are no plants in there of course. Also, I have read on here, that it takes 10 times the amount of water to flush out MG soil. So if you are growing in 3 gallon pots then flush the soil prior to planting with 30 gallons of water. The nute balls are varied in coating that thins with certain amount of water, allowing the nutes to be 'time released'. This is crazy and may not even work, but it is better than nothing. You also need pots that are not translucent. Another tip on CFL growing is to have the sides of the bulbs face the plant rather than the bottoms, you will get more lumen that way. Good luck!