ID help, please?

All I know (from what LFS told me) is Malawi Mbuna of some sort. The coloring in this picture is true, and he/she is very aggressive, but with 9 other Mbunas in the tank now, has settled down quite a bit, but still has everybody else cowed. I hope I loaded pic properly. Thanks, Ruth

The dark fish is #2 that I need help identifying, please. From a tank of "mixed African cichlids" - big mistake, I have since learned. However, this guy is one of 2 of the same, both pretty placid, but absolutely the #1 and #2 favorite victims of Pic #1. Both of these are about 3", and the one not in this pic has an overbite, rather than an underbite. Very dark, purply, with barring.

Thanks!

Thanks, I appreciate your help. Yes, the first one definitely didn't have any yellow when I first got him, around Christmas, and has picked up the yellow since then. The second one is quite dark, purply, with even darker stripes, but I just haven't seen anything like it in any pictures. It's tough to get a good pic of either of the two that I have, because they are almost always hiding.

The first two pics below are the same fish...the colors in the first pic are much lighter than reality. Colors in the second pic are true. The third picture is the 2nd one of these fish that I have - the one with the overbite. They are definitely purply, with faint darker barring, and both fish are about 3.5". Very placid and timid.

Ok, so now that I have a pretty good idea of these 3 mystery fish, I can now say, with relative certainty, that I have
-1 P. Acei or some sort of Metriaclima
-1 Labeotropheus of some sort
-1 P. Kenyi
-3 Labridochromis Caeruleus (Lion's Cove)
-3 Metriaclima Msobo (2 F, 1 M)

Not sure of all genders. The Kenyi is VERY aggressive, although just chases everybody, considers about 60% of the tank to be his. Before now, when I only had a few fish (mistake, I know), he killed the other Kenyi that came home from LFS with him (overnight!), and 1 other mystery fish. After that, I added 7 new fish at once, kept the lights off and a towel over the tank for 12 hours.

Everybody else is peaceful, although online profiles indicate that the Msobos are aggressive, as are the Labeotropheus. In addition, the Labeotropheus have a max size of 7".

I have a 55 gal tank, with a lot of rockwork and hiding places. Should I consider re-homing any of these fish now, rather than wait? I'd like to fill out the stock on this tank (to about 15-20 fish), and need to do it fairly quickly, so that I don't have to spend $20-25 per fish to get adults.

Any thoughts? Thanks.