I would suggest some nice fish that get big like grouper, lionfish, dogface puffer, niger trigger or bluthroat..just go aggressive. No coral beauty or tangs. The grouper could make short work of the damsels, so you might consider removing them. I would think an NBA player would like big bold fish. maybe you could show him some pics online, and teach him something about their personalities and get an idea what he might like. I think putting tangs into tanks where people are'nt going to insure their diet is proper is a mistake..actually that goes for any fish. Who will care for the fish? If an experienced aquarist will care for the tank, and since this guy probably has the money..it might be nice to turn it into a butterfly and fairy wrasse tank and just go the other direction with it.[pretty fish} Or...even some nice big angels like an emporer or a queen.