You really have nothing to worry about. The males will joust as soon as they are
sexable but, I have never had it amount to much. As for breeding them you'll
have to wait awhile on that. In MY experience furcatus do not start breeding
until they are around 6-9 months of age. Yours are very young yet. Give them a
decent sized tank to live in, at least 10gal for now and then around a 15-25
long as they become mature.
Be sure and provide a varied diet and feed live foods like mosquito larvae as
much as you can. As they grow the males will continue with their dominance
displays. This is one beautiful fish and the males are especially beautiful when
courting or mock fighting.
If you have any other questions...
Chris