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320 Posts
as long as the breeder box is in the same tank and isn't filling up with waste she'll be fine for as long as you need to have her in there. Guppies are very hardy, the only issue I see with breeder boxes is it could add stress, I've seen some attempts on here where people scraped up their breeder boxes so they couldn't see through to see the other fish and stress out that they are in the breeder box, and added some floating plants to the breeder box to calm them too, all seems to be a good idea to me...