Since I'm on an opinionated tear this evening, waterfalls, although having moving water, also can harbor unwanted bacteria. Any container with water is prone to bacteria buildup. It cannot possibly provide as much humidity as a good humidifier. Invest in a Venta Sonic. I am sure you will find others here to discourage the waterfall. The humidifier is equally good for the orchids. Look on Ebay for a bargain but Bed Bath and Beyond have them and they will run for well over 12-15 hours before refilling.