Nitrate Reducing Land Plants
Start a more aggressive water change routine. That's the best way to reduce nitrates. Land plants will work, but the plant must have a large root ball with all the potting mixture removed. It also needs a constant source of oxygen to the roots. Pothos doesn't grow large enough to impact the nitrate levels in the water, it doesn't have a large enough root system.
Having a plant growing out of the filter is a nice conversation piece, but this plant isn't effective for nitrate control. If you want a land plant that's a real nitrate user, research Chinese evergreen.
"Fear not, my young apprentice. Just change the tank water."