hey everyone. Ive just recieved a SUPER 1002 VORTEX PROTEIN SKIMMER which im going to use on my 37 gallon reef tank im in the process of setting up. I need some help on figuring it out, and how to work it. Plus in the online pictures it shows a black looking piece at the end of the intake tube....and mine just have that! Is that a big deal? Next im having trouble on figuring out where you want the water level to be inside the skimmer. Do you want it to flow just below the collection cup? up to the top of the collection cup so it spills over everynow and then? or wat? i cant figure out what level of flow you want to adjust it to. Anyways someone please help thanks!