How big is your tank?
Guppies can't go in with goldfish.. guppies like warm water, and guppies like cold. Minnows can i think there cold water. I'm not sure about bettas, i think there kinda middle ground but i could be wrong..
Ideally you should have 1 gallon of water per inch of fish.. guppies are about 2 inches, so 2 gallons per guppy. But this isn't true with all fish.. some fish are messier, or need cleaner water. Goldfish need 10 gallons for each fish, since they will get bigger and create more waste.. You also have to keep in mind that goldfish might get larger than any fish you put in there, so it could eat them.
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