you might get away with the platies and the tetras if they are deep bodied. you will have to make sure the senegal is well fed. once he starts getting a little bigger he wont be happy with just bloodworm unless its alot! I made that mistake and my 4 inch senegal took out a 3 inch filament barb. he made a lucky grab for it and git its eye. then when it couldnt get away grabbed it properly and wss like a crocodile death rolling trying to tear chunks off. since then I fed bigger meatier foods and no issues. hoplo catfish are a good choice. too big to eat and pretty well armoured. wouldnt chance corys unless you can get them big to begin with. basically, provided it wont fit in the senegals mouth you should be good. nothing too aggressive though. they arent IME violent fish. what are the dimensions of the 55? maybe the senegal, shoal of tetras/ platies. couple of hoplo catfish and maybe a firemouth could work. when I had firemouth it didnt bother my bichirs at all.
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