That humidifier looks like a good idea but the typos in the instructions could confuse people. He mixes up the two hoses when referring to them. He calls the one with the airstone the hose which goes to the enclosure and vice versa.

He also doesn't really mention what exactly to do with the hose coming back out of the bottle. I assume direct it into the enclosure somehow. I guess if it was me I'd melt a hole into the side of the tub (or screen top) and then tape it in place.