Ah, okay, I see whats going on there.  I unfortunately won't be able to submerge the drain line below the water surface like that, as the water just free-falls from the overflow grating into the chamber.  And its the sound of the water falling that is irritating -- if the rock needs to be submerged this won't work as well for me...
Hmm, I guess I could just fit some filter foam in the space underneath the overflow grating, essentially allowing the water to flow through that.... I suspect it'll become a nitrate factory, however.
				
			Hmm, I guess I could just fit some filter foam in the space underneath the overflow grating, essentially allowing the water to flow through that.... I suspect it'll become a nitrate factory, however.
 
				
 
 
		 
 
		 
	 
 
		 
	 
	 
	 
	