I was recommended water wisteria(hygrophila) a while ago for the frogs and that is what i plan to get for the new tank, its basically no maintenance as it grows in both low and high light, the leaves differ depending on how its grown and apparently it grows quite quickly too but you just have to keep trimming it down whenever it gets too much. sounds easy peasy to me which is what i need because i also dont know much about real plants! oh and cobomba was recommended to me on here and after a look on ebay thats another on the list as its gorgeous!