Cichlid Mixing

Question
Hello again,
Can Lake Malawi and Lake Tanganyika cichlids share the same aquarium once they are all of the same size?

Answer
There's really no issue mixing rift lake cichlids. The main concern, as with any cichlid, is that the fish are compatible with respect to aggression. You don't want to add a Tanganyikan such as a Birchardi with a Malawi such as an Auratus, but that doesn't mean that you can't mix a Lamp. tretacephalus and an Aulonocara. Also, like you mentioned, size is an issue as well. I'm sure you've got that down.
Best of luck.