Another "what fish?" post!

Hi!

I'm completely new to Cichlids, having successfully maintained a thriving
community tank for some time now. I'm also new to this board (obviously) and
(if it makes any difference!) I live in Scotland.

I'm picking up a new tank tomorrow (Juwel Rio 300 - approx 75 US gallons
IIRC - plus a big Eheim Pro filter, Cichlid-specific substrate and /lots/ of
Tufa rock), which I intend to set up for a "community" of Mbuna.

Soooooo, the big (and cliche'd) question is, "Will these fish get along OK?"

1 trio Iodotropheus Sprengerae
1 trio Labidochromis Caeruleus
1 quartet Metriaclima Estherae
1 quartet Pseudotropheus Demasoni
1 quartet Metriaclima Crabro

My main (again, cliche'd) intention is to keep the tank as active, but
stress-free, as possible. I expect /some/ aggression - they are Mbuna after
all - but I want to avoid constant fights and/or killing sprees!

Secondly, I would also like to keep 1 or 2 Synodontis cats (ideally
Angelicus, if they are suited to a Mbuna tank), and a couple of nice
Plec's - which ones would be recommended?

And last, but certainly not least, how does this look for a stocking level?
As much as I have tried to research the various under-stocking/over-stocking
theories, it is very difficult to find a definitive answer. I realise that
there may be no such thing as a definitive answer, as we are talking about
"wild animals" after all, and every tank is different, but as I am
completely new to Cichlids, /some/ pointers are helpful!

Many thanks (in advance!)

James