I have a HOB overflow , and for some reason the amount of bubbles that comes out of the overflow drain is crazy. The tank is in my room so I'd like to see if I can fix it somehow. The overflow is a PF-NANO , the DT is a 15 gallon aqueon tank, with a 10 gallon sump underneath (yes I know thats goofy). I'm using a sicce 1.0 pump as the return and it only pushes water about two feet into the display tank. Any help would be appreciated!