Want to build my own Sump . I was told that you should not have your Sump water level any deeper then 12 inches. I want to do 16 inches and make a stand for my protein skimmer to keep it running around the 8 inch mark. I am also going to do a deep sand bed does this need to be raised closer to the top of the water aswell. Don't understand why the Sump water level should not be any higher then 12 inches please clarify. Thanks Jason