Would it be ok to keep Lamprichthys tanganicanus with your average cichlids? I love their color and bluish sheen. They will be potentially kept with julies, chalinochromis, cyprichromis, and shell dwellers. 40 gallon breeder tank.
I think they me be too peaceful compared to the others. It's always a gamble with African cichlids. I have a juli that will kill any other juli I put in his tank and other people have multiple julies in a tank.
40 gal might be too small. Lamprichthys tanganicanus are schooling fish so you would need 6-12 minimum. They are also very active an some say they should be in 60gal +.
Once Julie's pair up like other cave dwellers they won't tolerate others in their species. Shell dwellers like occelatus will be fine, they will fight for Territories and females so make sure they have enought shells and room ( think I read somewhere 6 inch squared space per male. Also females are ok untill they have eggs)
Also cyps need 55gal+ for non jumbo, and need to be in groups of 12 + . (I currently have 9 looking to get 3 more soon. NOTE: they aren't cheap fish start from £11 each )
chalinochromis if you are thinking chalinochromis brichardi need 50 gal also.
Also all these fish will do best with sand substrate and you will need enough rock to create territories for each fish that needs them plus some extra hiding spots for the open water skimmers that will need protection from aggression as pretty much all tangs are aggressive in some degree
So to answer your question yes they can and have been but you need the right conditions. Hope this helps and good luck.