Tank looks great. I just upgraded from a 55g to a 120g myself. You will need a liquid fertilizer even with fish. There are 17 essential nutrients that plants need that fish waste will not provide. Many people around here use Seachem's Flourish Comprehensive, including myself. I use the amount specified on the bottle (2 capfuls for my tank) once per week, a pay after your partial water change. Another thing I noticed, your sword plants need to be lifted out of the gravel a bit. You don't want the crown (where all the stems meet at the bottom) to be buried in the gravel, only the roots. Otherwise, the plant can eventually rot.
A job well done. Your tank looks great.