Some festae when small are timid. They are aggressive against their own kind for sure. I have a wild male right now around 7" that is like that but I also have a 12-13" male that is like king kong in his tank. The 7" male is with 3 females around the same size and he's starting to flare up and show some dominance for once, give yours some time. Owning festae takes patience of all kinds...if your looking for attitude and aggression then maybe they are not for you.
I would suggest red tiger motaguense those fish are down right nasty, they are red and beautiful