In my old lizard and turtle tanks i used peace lilies they do not need to be planted in dirt or fertilized to be healthy. (they are the same plants people used to use in those betta bowls with the roots in the water and the plant coming out the top) You can get the at lowes, home depot...for cheap and all you do is take the plant out of the pot, rinse out the dirt from the roots, and either put it on the side of your tank with water and hold it up with rocks or get a cup big enough for the roots to be in and fill it with water and gravel or substrait to hold it up.