Two male banggai cardinalfish. Is this a problem?

So I recently bought 2 banggai cardinalfish in hopes for a pair. I watched the tank they were in at my LFS for a while to see which ones seemed to like each other most and then I picked my two. After looking at a few gender identification threads it seems I have two males. I kind of wondered though because for the past few days they have been puffing out their throats at each other as a display. They haven't done much more than that yet, but they are still young. At this point it's just amusing to watch. I fear though that it could turn more ugly as they get older. Should I worry? Thanks.