My perc pair, for the most part, never leave their Haddoni --- there is only a tailspot blenny in the tank, so reason for fear --- will stay within inches of it when I feed.
My pink skunk pair, stays on the half of the tank that has their Haddoni, but are out and about, though do sleep in it.
My saddleback has 2 haddonis to choose from, and switches off between the two, and spends about half of its time out and about. Does sleep in the same Haddoni each night.