If you dont want to fuss around gravel with plants in then
a)moss balls? or get plants that attatch to bogwood such as anubias,java ferns, java moss
b)change to sand substrate as the crap stays on top of the sand.
Vallis spiralis although very easy to grow, will overrun the tank as they send out shoots on a very regular basis
I had a hygrophilia species on my first tank which i had to trim weekly so that wont suit your needs either