I am using a Bashsea 30-14-16 biofuge. Pictured below. Also using reef octopus classic 150 internal skimmer. My issue is water level in fuge area. If I keep water level below adjustable gate (area marked in drawing) water flows great, but fuge area water level is too low. When I bring level up onto adjustable gate area it actually pulls water back under gate into skimmer section and flow diminishes in fuge section. So my deduction is either I need to seal adjustable gate or is my skimmer to big and causing a vacuum.