For the most part they get along, the kole is VERY aggressive! There is some occasional tail swatting but never anything too serious. The Naso acts as a peacemaker typically and shoos everything to a neutral corner. As you can see in the photo the Kole has lost it spines on the tail, that is a result of beating up his reflection on a daily basis. Hes a bastard fish but I've grown fond of him.