cobalt blues

how do you guys think these would do with peacocks and malawi blue dolphins? or these more like mbuna??

Cobalt blues are basically like Red Zebras in terms of aggression. They are also a type of mbuna (I own 1 cobalt blue).

I would keep cobalt blues away from blue dolphins only on the basis that blue dolphins are very peaceful and will not beable to defend themselves against similar sized mbuna. You can try it. If they are similar sized, they will be fine for a while until the higher growth difference of the mbuna becomes a factor.

Good luck and keep us updated!