well i would have to dissagree with santoury to some extent, though festae are somewhat aggresive, many esspetially females are not so much, i have a good feeling you will be able to house all those fish together, without extensive aggresion problems, until your pair of loiselli breed < then you may have some problems, belive me a have seen breeding pairs of parachromis, beat the liveing hell out of some fish, but overall loiselli are probably the least aggresive parachromis, so you really shouldn't have to worry about that to much, so overall, go for the female festae and the others together, but i persoanlly wouldn't add anything else to the tank.