Nope. Shouldn't. If you want, get a hagen surface skimmer or find an attachment for the Rio that will skim the surface. I got a bit of the gunk buildup on the surface when I took mine away, now that it's back, it's fabu, and scum free.
You have to realize that all that gunk is what SHOULD be going into the skimmer, but since (for some reason) these skimmers are designed to suck water like a standard HOB, they miss all that stuff. I'm pretty positive adding one of those on will change things quite a bit. It's 15 bucks well spent.
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