Great pics, some nasty mid-size fish there in the kendalli and cylindricus, and the buescheri are badasses for their size. Are they all in the same tank?
The 5 young Zaire gold buescheri in my 220 look to be 2 pairs and a single, and between them they control most of the bottom of the tank. They do seem to ignore the goby, but I've seen them chase off Cyp's and rainbows quite often. One pair was terrorizing the multi's until I rearranged the decor a bit. Ever since the dominant male orange cap dug a pit and started chasing/keeping most other fish at the far end of the tank they've given him leeway, but he is twice the size of any of them.
I picked up a bag of 6 itty-bitty cylindricus fry a couple months ago, have recently seen 2 of those still hanging in there, hoping more will become visible as they grow out. The buescheri keep them under wraps too, but there's enough cover that they don't get constantly hassled. I figure they'll move up in the pecking order once they get some size to them.