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Welcome to the Forum!

IME, Guppies should not be in anything less than a 10 gallon (20" long). They are active fish and the longer the footprint the better.

As far as water changes, it helps to know if the tank will have a filter. And do you know about cycling a tank? Here is this Forum's tutorial:

But a weekly 50% water change until the tank is cycled would be fine. SeaChem Prime is the key to safely cycling an aquarium.
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