DIY version: http://www.koiphen.com/forums/showthread.php?t=104042
 
Go through the whole thread. There are links to several versions. As far as I can understand it, yes, the foam is created by the agitation of the falling water (as opposed to injected air as in a traditional skimmer).
				
			Go through the whole thread. There are links to several versions. As far as I can understand it, yes, the foam is created by the agitation of the falling water (as opposed to injected air as in a traditional skimmer).
	
	

 Will hopefully post more next week. Have a great weekend!
