not that i am aware of. this is the skimmer i use. water flows through a cone filter in the over flow, through the skimmer and straight back into the tank.
if i leave the skimmer for two weeks or so, the way it used to be, yes it would begin to smell bad and the top cup would be filled with brown foam. however, since the tank has been with me (two weeks now) i have been cleaning it out as soon as it begins to become covered.
is it bad to clean it that much?
if it is pulling only water, how do you make it work properly?
i don't know off the top of my head. i can tell you that the cover for the cup has the "Led Zepplin ZOSO" sign on it. i do know that my father bought new in august from Absolutly Fish in NJ
Many skimmer manufacturers have their instructions available for download from their websites, so when you can check who the manufacturer is that would be a good thing to look into.
There is likely a way to control the height of the water in the skimmer, and if it is pulling out clear water it likely needs to be lowered.