11-16-2008, 11:40 AM
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In a 1 gallon container, if you have more than 2 or 3 fry, they will never get big enough to return to the main tank. You need to provide lots of space, good food and frequent water changes to get swordtail fry to grow. Given enough room to grow, the fry will be big enough in a month to survive with the adult swords. I would use no less than a 10 gallon to grow out a single swordtail drop to the point they could go back into the big fish's tank.
If you have heavy plantings in a peaceful, well fed community tank, you will get a few fry from each drop that survive. In a community tank like mine than has a betta, a large angel, several gold barbs, a few rasboras some rainbow cichlids, lots of mollies and platies, there are never any survivors. On the other hand, my endler tank, that only has endlers and cories in it, will rapidly fill to the point that there is no room for more fish to be comfortable. The same is true of my other single species livebearer tanks where the population grows until it starts to get a bit crowded. At that point there are usually enough hungry mouths that the expansion stops on its own.