I got a Red Sea Prizm PS from a friend but he didnt have the instruction manual. I have no idea how to set it up in the tank. It is fully assembled but there is a small clear flexible tube coming off the intake tube and I have no idea what this is for. Also what is the drainage port? Also how do I attach a hose for continuous waste removal like into a tub instead of the collection cup on top? On the intake tube is a round black circular thing,,,,,what is this for and what do I do with it? Thanks for anyone that can help me!!