I grew a banana plant in plain gravel, no ferts, under a standard T-8 bulb and it did fine. Some of the shoots developed into 4" round floating leaves and when I separated them from the stem (left about 1-2" of stem attached) that leaf developed into an entirely new plant. Sometimes I would clip all surface seeking shoots to promote the growth of submerged leaves. Ironically, when I upgraded the lights and started using ferts, it died off. It was a couple of years old.