Stocking For All Male Mbuna Tank

[Ellphea]

I have a 55 gallon all male mbuna tank. I am looking to add a few more fish species to the mix as mine are all still juvies. 
Here is what I currently have:
Melanochromis johanni (electric blue johanni)
Labidochromis caeruleus (Electric yellow labido)
Melanochromis auratus
Maylandia zebra (red zebra)
Pseudotropheus acei
Pseudotropheus demasoni
Pseudotropheus crabro (bumblebee)
 
The colors/bold/underlines are meaningless. I also have a few syno cats of unknown species. I am open to all suggestions! I would also like to know a good place to order the fish from since I don't have a LFS nearby. 

 

[Munroco]

My favourites might be on the small side for you. Julidochromis Marlieri and Chalinochromis Brichardi. Both very beautiful fish.

 

[Ellphea]

Those are both lovely but are Tanganyika cichlids and mine is a Malawi tank. I don't know that they would fair well with mine

 

[james41683]

It'll be trail and error getting a combo that will work. Best option would be to pick out mbuna you like, if a fish is to aggressive or getting beat up, remove it a try another. The crabro and melanochromis will probably end up being too aggressive for a 4ft tank, not to mention crabro get pretty large for a mbuna.

 

[crisycrunch]

I'd probably get rid of the auratus and crabro...they get insane aggressive in a 55 gallon tank...all the rest look good to me