gymnothorax polyuranodon is completely freshwater, would a jardini/black arowana fit? they usually are smaller than a full size silver
Freshwater Tiger Moray eel is actually fully freshwater species. Much research has been done that some have lived their entire lives in freshwater even though most will move to brackish and saltwater when they get larger. I don’t see a problem with a few tiger moray eels in the 240g. While they can get pretty big 3ft. Pretty flexible and dont move around a lot. Don’t know much about the Sailfin Pim so hopefully others chime in with that!You couldn't fit an arowana long term. Pbass I don't know about....others can chime in on that. Tiger eels won't work because they are brackish (assuming the catfish you want is freshwater).
I did see this and wonder where the op was located as I know us gallonage and uk gallonage are very different but not 120 g different! It does vastly change the fish availability though!240 is 8x2x2
360 is 8x3x2
I would consider 12 inches as a max size fish for that tanki reside in CA, US apolgizes for the mistype, the tank is 8x2x2