natural selection im afriad
In a batch of 100 eggs it is not uncommon to get several die off, i have had up to 20% die off as they grow. The trick is to get the dead fry out of the tank ASAP!! as they will pollute the water, as horrible as that sounds. Don't over react with water changes as that may send the tank into a mini cycle and fry can not stand ammonia.
Just keep the tank stable and clean. I do 20% changes every 2 days or so, and i make sure to remove all old food, for this reason i feed them cucumber as its easy to remove.
good luck and fingers crossed thats all that pass away
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