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I have a 55gal. tank. I have a male and female swordtail, a bolivian ram, 5 zebrafish, and 2 puffers. My swordtail is pregnant, and I've never had a pregnant fish, so I read the guide on breeding guppies. All the fish are small, and I think the puffers will be too small to eat the baby swordtail. So, could it be okay to just let the female swordtail give birth in the tank and not keep it in a breeder box or net?