I have an issue with my water return pump. I have an Octo AQ3000 return pump in my sump and an Octo classic 50 int protein skimmer. My issue is that my return pump sucks more water than the skimmer can put out. Both are manually adjustable except the pump suction doesn’t change no matter what i turn it to. The wall between my skimmer and the clean water chamber is adjustable but if I raise the wall the chamber runs so low that the air purge fills the display tank with bubbles galore. There is a steady flow of clean water coming from the skimmer but not fast enough to keep the retun chamber filled enough to avoid purging. Please, any suggestions.