Ok, so I've been doing a lot of research, and setting the tank up slowly... I have a lot of rocks that I've made from foam/concrete, with caves and hiding spots, and my ph is stable at around 7.9. I have given up hope on a jungle looking tank, but it will still be lightly planted.
My question now is, why is it not advised to mix fish from lake malawi and lake tanganyika? It seems like both fish can withstand similar water conditions... I'm not too worried about recreating their natural environment, since they don't live in a glass box in the wild anyways... but I also don't want a bloodbath.
In particular, I am looking at the five bar cichlids from tanganyika (Neolamprologus tretocephalus) and the Yellow Lab from Malawi (Labidochromis caeruleus). As far as I can tell, both are semi-aggressive and similar sized, which should work ok, right? I have also read that they do not burrow much and are safe for plants. I am considering 2 pairs of each.
Another question I have, where can I purchased sexed cichlids, preferably juveniles? My LFS has no idea how to sex them, and after looking for a while, I'm pretty sure they had all males... but I'm only going by what I've read online. Keeping the male/female balance in check is crucial in a 55g I think...