Is your tap water hard or soft?
Some fry can be very sensitive to large water changes. It may be better to begin changing from the soft water to teh tap water now while they are eggs. Change about 10 to 25% per day... That should work well but I cannot garantee teh results. If your tap water drasticly different to the soft water then even such a small change could do damage---but it is far more likely to hurt the naked fry as opposed to the protected eggs.
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