I have a melon sword, about a 20 narrowleaf chain swords, and some red rotala(think I miss spelled that) all in my ten gallon, no soil, no fertz just light water and fish poop and what ever the corys and ghosties don't eat. The do just fine my sword puts on a new leaf every few days or so, lets the leaf grow out, then starts a new one. My narrow leaf sent out runners and one of the babies Is about to send off a new runner.