scott - I have not bred festae but IME getting your stock at a small size and having them grow up together is a very good way to minimize aggression, so is plenty of hidingspots , targetfish , good feeding and good clean water.
With guapotes I have observed that targetfish are almost indispensable to avoid having the male and female turn their aggression against eachother. I like using convicts as they stay relativley small and managable not presenting a real threat to the pair, furthermore you can construct hiding spots for convicts that the festae won't be able to get into.
As far as tanksize, you should let the pair form in a large tank with plenty of aquascape - once the pair is formed and of breeding age they can be moved to their own tank which can be smaller.
Good luck - they are beautiful fish.
With guapotes I have observed that targetfish are almost indispensable to avoid having the male and female turn their aggression against eachother. I like using convicts as they stay relativley small and managable not presenting a real threat to the pair, furthermore you can construct hiding spots for convicts that the festae won't be able to get into.
As far as tanksize, you should let the pair form in a large tank with plenty of aquascape - once the pair is formed and of breeding age they can be moved to their own tank which can be smaller.
Good luck - they are beautiful fish.