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its a 50 gallon tankWhen you say "50", do you mean 50 gallon or 50 liter? If it's 50 gallon you can keep nearly anything that you want, with a very few exceptions. Visit an aquarium shop, take note of what you like but don't buy anything!- and come home and do some research online to see if the species you liked will get along with each other.
If you mean 50 liter, that's a little more difficult- you're somewhat limited to nano fish and Bettas.