Grammatici certant, et adhuc sub iudice lis est "Though peaceful towards most tankmates, the Pacific Blue will become aggressive towards other fish of its own species. To keep multiple specimens, introduce the entire lot at once into a larger marine system. " http://www.liveaquaria.com/product/prod_display.cfm?c=15+43+330&pcatid=330 " They normally get along with a wide variety of fish except for other members of the surgeonfish family. Can be very hostile towards other blue tangs so expect some fighting to take place." http://piratefx.hubpages.com/hub/Blue-Tang "The Regal is compatible with other tangs, but males will be aggressive with other Regal males in the same tank."http://saltwater.tropicalfishandaquariums.com/Tangs/RegalTang.asp "Håller med hans! en som är mer aggresiv isåfall är scopas, min slogs rejält mot min imperator, däremot flavescence verkar hur snäll som helst." Det var inte frågan på tråden vilken som är mest aggresiva... men tack för svaret.