Swordtail Fries

some were born before others, some are runts, the bigger ones get more food

Thats the way it goes in nature, the stronger get more food.

I dont know if this is the case with swordtails, but if I dont keep my largest dwarf gourami fry well fed, they will turn and actually eat the smaller fry in the tank with them. Its a rough world!

Speaking from personal experience they will eat each other, a lot it seems. They dissapeared about 1 a week. I started with 7 swordtail fry, I now have 3. The big one is still pestering the smaller 2. I would think you could save more if you had a tank with some plants and decent sized. I have them in a small breeder tank not anyplace to really hide. I basically overfed them and they still ate each other.