Actually I somewhat disagree with Taz here. This could work with a little alteration.
1) get all males to avoid crossbreeding issues
2) Reduce red Zebra to 1 (if you go all male- if not all male then only 1 male red zebra in that tank and the rest female)
3) if you decide all male you could add a handful of Acei's to make up for reducing your Red Zebras. they are beautiful and sweet
Saulosi can be on the more mild side for african standards,
another thing to consider ..the Acei's have 2 options I'm aware of.. both the yellow tailed and white tailed ones. Both stunning fish.
Or be willing to cull any surviving babies if you decide to not go all male.
Important thing to keep peace is have large rock and cave structures with enough territories for each fish. I have plenty of the more aggressive mbuna..and all male at that with great success. Tons of funny behavior and spiteful antics.
I'm curious.. Are there multiple males of both the Estherae and the Callainos in your tank? BTW, totally not disagreeing with you. Just more idle curiosity.
I have 4 (I think, Rusty is fuming so I can't do a recount of my 100 mile an hour tank right now) different versions of the Metriaclima (zebra) types. I never see them go after each other and the only one I can see aggression that is noticeable is the greshakei. And he is by far not the tank boss. Also greshakei as well leaves alone the other Metriaclima. And my estherae is one of the biggest fish in my tank along side I. sprengerae and only after he bullied was for weeks did estherae(red zebra) attack back in defense the I. sprengerae.
Just don't think it's easy to lump the aggression differences into "can't do this can't do that " too much when done right..However I would love to find out how it goes with multiple identical males of these guys.
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