Definitely yes with labs.aaronjunited said:
I might try larger sexable male peacocks of the more robust species with smaller Ps. demasoni but...
1) Would not put them in at the same size e.g. (Peacocks >> 'lil Demons)
2) Would not pick smaller/timid peacock species
3) Would not waste time with females as I highly doubt they would ever breed with the 'lil demons in the tank.
4) Would have a tank ready for any peacock(s) that are/get unhappy to find them a new home.
Good Luck.