Pothos and philodendron vines are very good. Pothos is among the best. You just need to cut the vines tie them.in a bunch and stick them into the tank water a few inches.. periodically trim roots as these can grow very fast.
Note.. pothos is not a direct sun plant.. bright indirect light is best.
See this thread..
http://forum.simplydiscus.com/showth...ted-quot-tanks
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Hth,
Al