04-16-2013, 09:18 AM
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It sounds like you're doing a great job caring for the babies!
Keep in mind that not all fry are created equal, and with any brood there WILL be some that are smaller, weaker, or have genetic issues that will keep them from thriving. In the natural world these would be the ones most likely to be predated by other fish (which is one reason why live-bearers have such large broods). In tanks, many of them are often able to live to adulthood. . . the age and condition of the parent fish, especially momma, also plays a big role in how hearty the fry will be.
It sounds like you're doing the best you can, keep up the good work, and try not to be too dissapointed if they don't all make it. . . it's just nature, and while it might be sad, it probably has nothing to do with your care! If you keep on like this, you'll likely be drowning in Platy before too much time has gone by! Good luck!