I just got a sump for my 55 gal fish only tank and i also have a hang on back skimmer....I'd like to put the skimmer in the sump.....the skimmer has a pump and the sump has a pump, can I direct the water from the overflow box on the tank into the skimmer or put a "Y" fitting in the sump pump and have it feed theskimmer or does each thing need its own pump?