First of all you should have bought the plant and aquarium lights made by GE from wally world, there actually a wide spectrum 2000 lumen bulb which has an equallity of spectrums another thing is never bolt the back of those floro fixtures to anything because heat is being trapped in at the top may cause burning out of fixture or a fire if your using wood for bracket. Ur Mg soil is fine...dont feed for the first 3-4 weeks, water strong for minor flushing of nutes, and only use a weak nute when its time; id say right around four weeks slowly start introducing nutes with a quarter of the dosage directed on the package then gradually max out over the next for weeks. Then the rest is up to you my friend!