Yeah the lungfish are kind of important (thus the username) so I am looking to keep those in whatever I choose. Just posted the updated version of the layout so if you could look at that?Perhaps based off your list you could do the clown loaches, 1 Fire Eel, 1 Chinese hi fin banded Shark, and a bunch of archers.
Or the BGK, Arowana, and some cichlids.
Or giant tank full of mini fish, guppies, snails, rams, shrimp, corys, etc. Perhaps that with Discus (just take out the shrimp unless you do the really large shrimp breeds such as vampire or bamboo).