Oh yeah,Nimbochromis livingstonii I forgot about that one....it's been a while lol but I guess I got the Melanochromis auratus right though.You hove a livingstoni and an auratus
So by the picture do you think the auratus fish is fully grown?Oh yeah,the other fish is some type of mbuna,Melanochromis I think and it is the smaller growing of the two...not sure if you are aware or not but they are both African cichlids.I used to be heavily into them years ago.