Well, keep in mind the mother might eat most of the fry. If you want them to survive make sure to give them plenty of plants to hide in
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Cory cats would be a great choice but stick to smaller species. I don't know how many fry will survive so it's hard to judge how much the tank will be stocked once they are born. Perhaps you could wait to add more fish until after she has her babies? Or you could add a few pygmy cory cats...those guys stay really small and won't add too much to the bio-load. But they aren't always easy to find.
Oto cats are another good choice and they eat algae
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Or how about some shrimp? Depending on your guppy some might get eaten but they will help keep the tank clean and barely add anything to the bio-load. I would start with ghost shrimp because they are cheap, lol.
By the way, I would take some gravel and water from the already cycled tank and put it in the new one. It'll really speed up the cycle
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Cory cats would be a great choice but stick to smaller species. I don't know how many fry will survive so it's hard to judge how much the tank will be stocked once they are born. Perhaps you could wait to add more fish until after she has her babies? Or you could add a few pygmy cory cats...those guys stay really small and won't add too much to the bio-load. But they aren't always easy to find.
Oto cats are another good choice and they eat algae
Or how about some shrimp? Depending on your guppy some might get eaten but they will help keep the tank clean and barely add anything to the bio-load. I would start with ghost shrimp because they are cheap, lol.
By the way, I would take some gravel and water from the already cycled tank and put it in the new one. It'll really speed up the cycle