Betta Vases The Popular Peace Lily betta Vases The set up generally consists of a clear glass vase stuffed with a Peace Lily and a Betta fish. The lily’s roots hang down into the water below where the Betta is kept. Sometimes the vase will contain marbles or gravel on the bottom. Often the arrangement contains instructions stating that the fish can live by chewing on the roots of the plant and only requires weekly water changes with dechlorinated water.