Originally Posted by pat8you
Mine is usually less than an inch. I keep it so the trim is covering the water line. I don't need a ton of surface agitation. Just enough to break up the oils and such. My skimmer and sump are enough to keep the water oxygenated.
This is how I keep mine also. Have a PH, HOB
filter and skimmer breaking my water surface, but still have some oil slicks on the top of my water (thast what I call them)