I'm of the opposite view. You've got a bit of a ticking time bomb if you allow aiptasia to thrive in your sump. Since they constantly clone themselves and reproduce eventually some aiptasia will be sucked up your return pump and into your display.
Since they are in your sump, you've got more options to get rid of them there assuming you aren't keeping any corals down there. Pick up a couple of reef unsafe camel shrimp and they'll go to town on the aiptasia.
On the zeovit forums, I think, this was a technique someone stumbled onto to get rid of aiptasia: place aiptasia covered rock in sump with camel shrimp then remove the rock as soon as they were done eating the aiptasia but before they started to snack on any corals on the rock.
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