I may be wrong here and get shot down from all sides ( again ) but they look kinda like my old Lake Malawi cichlids I used to keep a while back
If so the one thing to remember is that these are 'usually' get very territorial , very quickly and weirdly the best thing to do is to loads of rocky areas giving little territories and hiding places AND also they thrive when there are huge numbers of them as it cuts down on the bullying ( its true !) .
It goes against everything we are told in the fish keeping world but it works with Lake Malawi cichlids .
https://www.flickr.com/photos/dianesdigitals/925776775/
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