Saltwater Tank:Atlantic Sturgeons...
Freshwater Tank: Jack Dempseys, Jaguar Cichlids, Dovii, Red Devil, Umbee, SA lungfish, bowfin, Florida gar, TSN, polypterus, aba aba, and one electric eel
Brackish Tank: Dragon Gobies
I would make it a giant gourami community with peacock bass, rays, silver arowana and a centerpiece alligator gar. There would be like 10 giant gouramis each over 2', 3 silver arowanas over 3' and those mature peacock bass hitting >2'.
Il stick 2-3 blue eye plecos to keep alge down, gator gar, aparama, armatus, rays, dats, temm, mono, orino, azul, bahia Kelberi- bass, RTC, TSN a huge fire ell, clown, gold and royal knife and 2 I'd sharks.
I'd throw all my cichlids in there to see how they'd interact with that much space. ( la ceiba yellow heads, jag, RTM, festae, Cubans, greens terrors, Loiselli, black belt, jack ) I'd probably also throw in my clown loaches. Lots of driftwood plants and rocks. The possibilities are almost endless with that much space
South american biotope with P Bass, Severums, Angels, Geophagus, ray's, catfish, and tetras, lots and lots of tetras! with everything being wild caught. and mabe even a caiman?!?!?