A few things I want to note:
Continue using prime on every water change. It is one of the best dechlorinators out there.
When you say you have an Amazon sword, fern and aquatic fern, please differentiate "fern" and "aquatic fern" please. As far as the amazon sword goes, that is a heavy root feeding plant and will require fertilization of some sort, preferably in the form of root tabs.
Using just room lighting will not be enough for love aquatic plants. Not enough light will penetrate the water without an external light source.