I concur on the swords, as long as the tank has been established a while, or as long as you dose the tank with Flourish comprehensive.
I would also like to suggest any of the Hygrophila species.
is Hygrophila difformis
and there are two other nice ones, Hygrophila polysperma
and hygrophila corymbrosa. You might want to look into Hygrophila Bold var Sunset for color variety.)
I don't have good luck with trimming my Vallisneria... Sweetaquatics has a rare species of echinodorus (sword plant) that looks a lot like Corkscrew Vallisneria
(I'm thinking it's Echonidorus Tortiflora but I could be wrong and if not, don't trust my spelling.
Cryptocryne Spiralis could work as well if you like the look.
Anarchis (Egeria densa
) is also a nice stem plant IMO. Grows super fast, super thick, and doesn't 'shed' at all in my experience. (lower stems may get thinner, but they don't lose their leaves)
Oh and Rotala is nice, but might be hard to make it grow in thich enough to hide the back pane of glass...