I just got a HOB sump, cool item. Just trying to figure something out. First chamber fills and has a spillway into a three tray system with media ect. then it has a third section where the water fills and is pumped via powerhead with a hose back into the tank. My question is how do I get the siphon action to pull water from the tank into the first chamber to get the process started. It only came with a "J" shaped hose. I tried everything I know and cannot get it to work.