storage tank and flow in and out

I have a need to visually represent the flow into and out of a storage tank through a small dual port fitting in the lower area wall. I can get flow into the tank but can't get the flow to trace into the tank, disperse and then go back out of the tank through the fitting. I've tried environmental opening to the tank inside and then anotheroutlet volume flow thru the second port but it doesn't recognize the send opening. I tried staticpressure opening into the tank and theother port just open to the outlet and I tried getting the flow to travel into the tank and running a seperate trace out of the tank but the traces are not connected that way. any thoughts?

dboring@fafco.com