Welcome to the forum and to TFK first of all, hope you enjoy your time here.
OK, one issue, Red empress = not good for your size tank. They are active swimmers and a tank that size does not give them enough room to do that. They also regularly grow to about 7-8"
Do you know what sex they are?
By the electric blues do you mean Sciaenochromis fryeri...if these are the ones you mean, they are NOT suitable either for your size tank, they need a 75g or bigger tank.
The black and white ones if you mean Tropheus duboisi - again sorry the tank is not big enough as they are very aggressive fish.
I would look at losing the red empress and consider something more appropriate such as Rusty Cichlid, Afra, Red Zebra. Cichlids are harem fish meaning a single male needs several usually 4, up to 12 females for the more aggressive species. This ratio means the aggression of the male when in spawning mode is directed at a group of female and not a single female. Aggression towards a single female will usually leave her with a weakened immune system or in most of the cases dead.
If you have any other fish you are considering please post them here and we will offer suggestions as to whether they will work with your tank.