Reading on <A HREF="http://www.proteinskimmer.com/products/Urchin.htm">this page</A> it says, "Place directly on sump bottom - up to 12" deep ". Does this mean the water can not come any higher then 12" on the skimmer? I understand I can adjust the O ring as the height of the water and the height of the bubbles change, but is there some optimal height the water should be kept at. I was thinking originally of just throwing it in a sump, but I think I will place it in such a way the height of the water that surrounds it does not change.
Also does anyone think it's possible or practice to plumb this in such a way that the return heads straight into it. I was wondering if I could perhaps leave out the pump or use it elsewhere and just rely on the water coming down and all directly skim surface scum from the displays.
Jon