LOL wow
that smaller one right there might be a male or female. its to early to tell. hes probably only about a month and a half old. i got some that size.
your larger one...wow. im surprised it hasnt made a snack of the little guy
id say the bigger one looks to be a male. theres not a whole lot of red/pink on the belly and the fins kind of look lyre-like. males fins are more like that than females.