Not a S. haddoni, but my bta decided one day to make a trek across my tank from lower right to extreme upper left corner. This happened to be the same day I added a school of 11 green chromis to the tank. After a week (when the bta decided to go back to the rocks in the bottom), all but 2 had died, and they looked horrible. I figured out they had all been sleeping in the corner the bta was in, getting stung all night long, and then doing death rolls on the bottom like they were some morbid synchronized swimming team... Sometimes I really hate that bta. ;-)