well the fishing line method has been deployed and I'm waiting for my first bite. I will get some live this weekend if neither have taken food as i really want to keep these guys strong.
Something i have learned is that it is not necessarily the biggest that is the leader. The larger of the 2 certainly seems to be more submissive to the smaller and is following it around. Not constantly, but it is not the norm of the usual shoaling behaviour i have seen. They don't spend every moment together though. there is a definite independence to them as well. They have a large open area to swim but so far have been reclusive and fairly shy, sticking to the planted and wooded ends over the open areas. However they do not accept nor like the little geo's boisterousness and will chase them but not snap at them, despite being contenders for snack of the month. I would certainly say that in my short experience so far despite their physical demeanour, with their large teeth and ominous 'stalker' style presence, they are certainly shyer and more fragile than most fish of such a predacious nature.
I compare them to the Geo's that arrived the exact same day, who are 1/4 their size and who have settled in, established a heirachy and are feeding on everything available. Suddenly it becomes fully apparent the potential fragility of the species in the Aquaria. I'm sure and certainly hope, that they will come out of their shell and strike a more dominant role within the tank but can certainly understand why you do not reccomend larger Cichlid species.
Once i have sucessfuly fed them i will try harder to feed dead food. For the record, here is an image of one of them at point of entry into the tank;
And the other with 3 of the geo's;
I have no idea if the above is of value to anyone or even true for others but it is most certainly my observation of my pair.