I just purchased the aquapod 12 gallon w/ compact lighting. The problem I'm having is with the dual splitter thingy that attaches to the flow coming out of the "sump" area. Is there something I'm missing??? I can't get it to fit tight. It's super loose and comes flying off when the pump is turned on

Someone please save me before I feel even more like a complete idiot!!!

It looks like they call it the "return nozzle"