FH with Oscar = a dead Oscar.
As far as a tank with that size goes, only 1 flowerhorn and that is it. If you want puffers to be living together, it can be done with green spotted puffers and dwarf puffers. I've owned them before from a community puffer tank to a one of a hell aggressive fahaka.
As far as the KKP goes, keep your eye on it. Their temperament are not the same as BP and they can murder an oscar believe it or not. By the way, most KKP or BP or Mammon will not be able to breed with another one. Females are most likely fertile, but all the males are sterile. I think they got sterile from the breeder itself due to the fact that they want the LFS to keep ordering from them and don't want any KKP/BP keeper to breed them at home. Since they all will come out to be alike, it is not the same as flowerhorn where they come out either nice or bad. And even if they come out nice, only top 5% or so of the frys will come out nice(flowerhorns here not KKP/BP).
The only way to tell the sex between a KKP/BP/Mammon is to vent them.
