I dont think that picture and mondo grass are the same thing. They look different.....im looking in my plant book and this looks exactly like something called a Fountain Plant. Scientific name (Ophiopogon Japonica). Im qouting here.
"Plant with leathery, sturdy and arched leaves, requires little light, suitable for terrarium and aquarium with cichlids."
Origin: Japan,Indonesia
Lifespan Submerged: 12 months and more
So it sounds like it will do okay for a year and likes hard water.....but ideally not an aquarium plant