I can say from experience, that they tend to hover. Not sure what species fish you are talking about in particular...but my cichlids used to stay in the same spots (like it was there own space) everynight. Even in the mornings...when the lights would come on for feeding they would sssslllllloooowwwwllllyyyyy come out of their caves and spaces and creep to the surface...almost like I do when I stumble to my pot of coffee in the morning.