Originally Posted by mrsaltmiller
It appears my platy gave birth last night. I don't see any live fry unless they are doing a really good job hiding in the floating plants. What I do see is what appears to be dead fry and circular egg looking things that have an eyeball on it. All of these are at the bottom of the tank in the rocks. I took pictures of a couple of them. Is it possible that these are just aborted fry, or were they eaten by the other fish (platys and danios) and spit out the eyeballs or??? I checked my levels and all are good and the temperature is fine.
I keep several tanks of Platys and Danios, but not together. Danios are aggressive toward small fish, like your Platy fry. I keep large tanks, heavily planted on the surface, so the fry have ample places to hide. Healthy fry will immediately swim to the surface for air and to avoid hungry adults. That's why the surface needs a thick growth of plants like Hornwort and Anacharis for cover.
Livebearers are fast breeders and really need larger tanks, so there's room for all of them. I keep 55 and 60 gallon tanks for the livebearers and smaller tanks 20 gallons or so for the Danios. They don't reproduce as quickly. I change half the tank water every week. Small water changes leave dissolved wastes in the water and poor water conditions results in poor health for the fry.