Can a Kole Tang and Yellow Tang get along

[Taipan]

Perhaps.....you can bring your Yellow Tang downstairs first; and introduce it into the system with the Kole Tang first. Let them become 'acquainted' in the Yellow Tang's NEW environment. Since the Kole is familiar with the surroundings; it may be less intimidated and the Yellow Tang is unfamiliar territory. Once (if) they 'get along'; bring them both upstairs to the 'new' environment. New environment; fewer territory issues. In theory. That is....also.....if your upstairs display can go a little while without an algae grazer. Good Luck.