Totally agree with Pirhana45..You mix Tropheus with much else, be careful about diet. Very easy for them to get Bloat if fed high protein diet. Calvus need more protein to grow (they do it slow regardless, but try not feeding them much protein!).
The big haps and Mbuna from malawi will eventually terrorize your calvus. Stick with Taganikyans, or if you must have malawi, avoid mbuna (pseudotropheos, labeotropheus, melanochromis, etc.).
Moori and Dubosi are not a bad mix with the mbuna though, as long as they are about the same size. Bloat is a killer for Tropheus, no matter what species. Petrochromis are LESS susceptible, but still a bit risky.