Just read this thread for the first time and my instant hunch is that combining a Leopard Bushfish and Glass Catfish with any Rift Valley cichlids is a very bad idea, both these fish will not do well in an aggressive tank. They are shy species that are easily bullied, tankmates need to be mellow in general character and "eating manners."
Personally, I would look at more mellow African riverine cichlids, like African Butterfly Cichlids (Anomalochromis thomasi).
I don't know if you are aware of this already, but a 4-foot tank like this could easily house multiple Leopard Bushfish, I never have had any concerns or issues with my four (~8-12cm) in my Rio240 last summer and would be happy to move them into my 48x12x15 as and when I do another obssessive "fish juggle."