Where to start?
Right, Hepsetus odoe are very aggressive to other fish that swim in the upper and middle reaches of the tank so mixing them with needle nose or any other gar, pike or baracuda like fish is a bad idea, they have big teeth and they really do know how to use them.
Gulper cats dont get that name for nothing, they can and almost certainly will consume any fish up to nearly twice their own size so they dont mix well in predator communities, anything that is too big to be eaten will probably eat the gulper cat. Big predatory catfish are always a risk in pred communities (as i recently rediscovered to the loss of a 5" stingray) so choose species with caution or go with non predatory cats like large Doradids.
African lungfish are species tank only, they are just purely nasty and will kill fish just for being there, NOTHING is safe with them. However if you really like lung fish then the South American lungfish, Lepidosiren paradoxa, is community safe with large fish providing they are active and dont just sit around on the bottom where the lungfish can sneak up and bite them.
Large spiny eels like tyre tracks do well in large fish communities, no problems there.
There is a freshwater toad fish (Thalassophryne amazonica) but they are fairly small fish that are difficult to feed due to their sedentry lifestyle and need for live foods, in community type tanks they usually just starve as they will just sit and wait for the feeders to sit on their head.
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