Swords will do well in subdued lighting and as long as you change the tank water regularly and have a reasonable fish load, the combination of the water changes and the fish wastes that dissolve in the tank water, will be enough to fertilize your less demanding plants. The lighting can be no more than a watt to 1.5 watts per gallon of tank volume.
Commercial ferts tend to be pricey and the effort sometimes needed to dose them properly may not be needed. I keep varieties of Anubias, Cryptocoryne, Singapore moss, Java fern, Anacharis and Pennywort and very rarely use ferts. I do large, regular water changes and feed the fish a balanced diet. These are the best longer term fertilizers.
"Fear not, my young apprentice. Just change the tank water."