Brackish
Gymnothorax tile ('Freshwater' Moray eel)

Eels (Spiny eels, true eels, etc)
Macrognathus siamensis (Peacock spiny eel)
Mastacembelus erythrotaenia (Fire eel)
Tanganyikan spiny eel ((Aethio)mastacembelus ellipsifer)

Knifefish
Apteronotus albifrons (Black ghost knife)
Eigenmannia virescens (Glass/Transparent knifefish)
Gymnotus carapo
Xenomystus nigri (African knife fish)

Piranha
Pygocentrus nattereri (Red belly)
Pygopristis denticulata (Orange Finned Piranha)

Polypterids (bichirs)
Erpetoichthys calabaricus (Ropefish/Reedfish)
Polypterus delhezi (Armoured bichir)
Polypterus ornatipinnis (Ornate bichir)
Polypterus palmas polli (Marbled bichir)
Polypterus senegalus (Senegal bichir)

Puffers
Colomesus asellus (South American puffer)
Takifugu ocellatus (Fugu/Orange Ring Puffer)
Tetraodon mbu (Giant freshwater puffer)

Snakeheads
Channa marulius (Blue snakehead) - one only

Stingrays (freshwater)
Potamotrygon motoro
Peruvian motoro
P. motoro x ocellata
Marble x normal motoro, captive bred

Miscellaneous Oddball and Rare fish
Achirrius lineatus (Freshwater Flatfish)
Datnioides microlepis (Siamese/Sumatran Tigerfish)
Datnioides undecimradiatus (Thin bar Siamese Tigerfish)
Distichodus affinis
Distichodus sexfasciatus
Electrophorus electricus (Electric eel)
Erythrinus sp. "Peru" (Red Wolf Fish)
Exodon paradoxus (Bucktoothed tetra)
Gnathonemus petersii (Elephantnose)
Hemiodus gracilis (Red Hemiodus)
Hoplias malabaricus (Wolf fish)
Lates niloticus (Nile Perch)
Lungfish, South American (Lepidosiren paradoxa)
Monochirris polycanthus (South American Leaf Fish)
Osteoglossum bicirrhosum (Silver arowana)
Puntius denisonii (Red Line Torpedo barb)
Scleropages jardini (Pearl arowana / Australian arowana)

Shrimps and other freshwater crustaceans
Amano Shrimp
Bee Shrimp
Crystal Red Shrimp
Orange Shrimp
Red Cherry Shrimp (Neocaradina heteropoda var Red)
Tiger Shrimp