[slief]

You open the nozzle until you get the foam nice and thick. I would start at 1.5 turns out and open it further from there until you get the foam where you like it. The more you open the nozzle, the more air goes into the skimmer. You are aiming for nice thick foam but since every system is different, the ideal settings will vary from one tank to the next based on the amount of dissolved organics in the water and other factors. Once you get the foam where you like it, use the wedge pipe to adjust the water level inside the skimmer between wet and dry skimming. I’d aim to get the line where bubbles turn to foam up to the bottom of the neck for a dry skim.