If you want a low maintenance, you'll be looking mainly at slow growing species, a few of my personal favourites include, Cryptocorynes, Anubias, Java fern (Microsorum pteropus), Mosses and Valiseneria, the list doesn't stop there, there are hundreds of others you can choose from.
Light is the limiting factor with plants, and if you want low tech, you'll only need a little light, fertilisers shouldn't be necessary, but if for instance any of your plants were lacking, adding an all in one fertiliser wouldn't be difficult. Other than that, good circulation is always good to help prevent ammonia accumulation which will eventually lead to algae. The reason you wont need fertilisers is because the fish waste should provide all appropriate nutrients the plants require. You wont need a plant specific substrate, so an inert substrate will be fine, and you can use anything you wish.
All the best
