I would really suggest, you remove the Dracena sanderiana - those are the "palm-like", white and green ones. They are not aquatic plants and will slowly but surely die.......polluting your tank in the process.
Sorry to be the bearer of bad news; but this is a fact !!
They are terrific window-plants, though, so if you just plant them in a pot, they will allmost certainly grow happily on........
If the "grassy" ones are Ophiopogon, the same goes for them - sorry!!!