You're going to need a stack more fast-growing stem plants for the NPT to work properly. It's recommended that you should cover 60-70% of the tank floor with plants for the first few months at least, until the tank settles and ages properly.
Anubias is slow-growing, and swords eat nitrogen but not a lot of ammonia. Wisteria's good, though.
You could get a stack of dwarf hairgrass, if your light's good, or some dwarf chain sword to fill in the gaps. I use elodea as a mass 'filler' - it's fine stemmed and leaved so it doesn't clog up view too much. Just don't plant it all up front, as it (and many other stems) get quite tall. Though your tank is tall-ish so maybe it would look quite good.
What's your light?
In a few months you can thin it all out some and replace the stems with other plants. But yeah - you need that floor covered, so the roots get to aerating the soil as it matures and use up all the excess nutrients of 'young' soil.