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How big is your nano? The yellow tail is one of the least aggressive the three stripe and the domino are the most aggressive from what I have seen. You might consider a clarki clown they are a little more aggressive but make sure your tank is large enough so there isn't a problem over territory.
Personally i would yank the damsel and swap it for a pair of clowns...Clowns are in the damsels family(cousins i guess you could say)and it could get ugly with one yellow tail and one clown...with 2 clowns however,,chances are they will pair up..that won't happen with a damsel and a clown
yeah,,but why...Is your tank not cycled?The reason some people still cycle with damsel fish is because they are hardy and only 3 bucks,,but clowns are 25 and up..i would make sure your tank is done and stable first