*As soon as you start to see aggression, theres no certian age, apparently earlier in PKs than longfins
*A bare bottomed tank is best otherwise the male won't be able to get to the fallen eggs/fry
*The actual spawn only needs the 1 female however some breeders condition 2 for two reasons
~ as a back up incase the first female doesn't bond/isn't ready
~to give the male a choice and encourage breeding to take place as a rival female is present
Hope this helps Alex