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I think that would be fine, as long as you restricted it to a single male and 2-3 females. However, if you plan on keeping any fry, I would go with a bigger tank, as you will easily be overstocked.
To be honest, to be safer I'd breed in a 20g. But if you still want to breed in a 10g, you're going to need a fry solution--and fast!
I'm just curious; does I matter if I don't have the same male:female ratio that people recommend? I have 4 males ( I think) and one female. I was planning on getting some females from the store but they hardly ever have them at mine. Coincidently, my life science teacher had 2 females and a male guppy in a tank in her class room, and hey had babies. My teacher was letting kids take them home. But they had to have a note signed by a parent and a picture of our fish tank to pegs that we had the right stuff for it. So I took a female home. It is almost full grown now and I might be seeing babies soon. I hope the males don't fight over her lol