I've given up on the atomizer idea. Instead, I figured I'd get a glass diffuser. Searching on eBay, I thought to myself, "self, wouldn't an airstone do exactly the same thing?" and because I don't know such things for certain, my next thought was, "self, ask fishlore!" and what do you know, here I am. But anyway, the airstone would mean I've got the tank - the counter and gage - and then just an airstone at the end of the air line? Is that it?