Please Help Me!!

I Have A Empty Fishtank Whit Aluminum Foil In The Inside. I Have Two 6 1/2" Plants. There In A 6 Inch Pot. I Have Very Good Soil From Wal-mart. I Have 2 25wt Fluorescent Bulbs On It 10 Hours Per Day, 10 Hours On Top Pourch To Get Some Good Sun And Good Air. And Sometimes Rain. I Water The Plant Every 2 Days Because Its A Small Pot, And The Soil Doesnt Dry Out Quick. I Havent Use Any Fertilizers. I Wanna Know If I Could Grow A Plant All Natural?
I Also Wanna Know If Im Going To Be Suscessful In Growing My Plant.

Sure you can. Just watch the leaves for signs of needing more nutes. Good sun, rain, and air is all it takes.