One of my 3 yellow tangs has outgrown the other two, does it mean he is a male?

[sensei]

I introduced 3 similar size yellow tangs in my dt a couple months ago but one is much bigger then the othe other two now. is there a meaning for that?

Thanks

 

[Moort82]

I'd say it's just the dominant one who gets more food. I know you can sex scopas tangs and other zebrasoma by the bristles on their caudal peduncle, so guessing it may be the same for yellows, but I haven't really seen or read of a size difference.