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Especially in a tank that's 20 gallons (which is small), do not add all the fish at once. This will overload the system and likely kill most of the fish.
Even though you said you didn't want guppies, you might consider buying a dollars worth of feeder guppies to break in the tank, then after a couple of weeks flushing them returning them to the pet store and getting the fish you really want.
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