Never really tried...but eventually I'll have built in overflows and the LifeReef overflows will be moved back to the filtration room as returns for my refugiums. The only major drawback to having hang on type overflows is the appearence!!
But they are very functional...even if the do look ugly!! I suppose it would be possible to have them covered with zoos...or even hide them better like broomer does...his are nearly totally hidden from view.