Lol, clowns will host almost anywhere. Most of them are raised in tanks anymore and they are one of the easiest s.w. fish to propogate. This won't cause any long term problems when the eggs hatch the babies will get sucked into the impeller most likely. This shouldn't even cause a minor fluctuation in your water params. If you ever decide that you want to raise them later on let us know and we'll help you out.
hth
Max