Do you have a sump? One of the reasons for having a sump is to have that oil slick drain into the sump, get mixed up into the watrer colum and then be pulled out by the skimmer.
If you don't have a sump then maybe try an overflow box for the skimmer, that will help pull stuff off the water surface.
I think, in time, you will find that the Seaclone is an underpowered skimmer, and I have no idea what black powder is. Is that a Mark Weiss product????
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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