Yeah, I keep the water level in the rear sump at the 4th line from the top. And the height of the gate is level with some plastic parts on the sides, I will post a pic for U too see. Mine took about a week or so to break in, but playing around with it cause it made microbubbles, now I got the airvalve open all the way and it skims great. No bubbles, just smelly nasty dark foam..