well dying has to happen unleess for somereason you create some super strong genes in the fry. ok you can buy a 3gallon bow-frontt tankand keep the fry in there. i keep all my swordtail fry(30-40) in a 5 gallon and they are fine. just one bad thing about keeping them in a tank, you will lose more fry buy getting some get sucked up the filter unless you buy just a tank without a filter and get a sponge filter.