Dwarf sag, tiger lily, and dwarf aquarium lily just go nuts for me even in low light, unfertilized, liquid rock set ups. Vals another one i like, you can almost see it grow, like if you come back in a few hours its noticably bigger. Anacharis is really easy for a stem as well, cabomba isnt to tough either. These plants i like as you buy them once and youll never need to buy them again.