11-08-2010, 06:24 PM
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It is definitely water quality.
there could be one of two things from my experience.
1) the bad water quality in the breeder, i always try to clean up their waste everyday with a syringe with a piece of vacuum line attached to the end ( basically a mini gravel vaccum for the little floating breeder things). It could have just got to a level too high and too quickly and killed them.
2) Did you just do a large water change the day before? I had a platy fry tank with LOADS of young platies cause i breed them. I got very busy with work and school over a week and a half and didnt do my water changes that i should for a tank with that many young fish. BUT they were all doing well it seemed, cause i didnt see any of them showing signs of poor water quality. So when i got a chance a week and a half later, i figured i would do a larger water change to make up for the week i sadly neglected their water change. Within literally hours they were all dying off left and right. I did an emergency transfer to another tank to save as many as i could but what happened was they had become accustomed to the water because the levels were rising slowly enough they could adjust and not get sick. SO when i did a large water change, the clean water wasnt what they were used to and they were shocked and died quickly especially since they were so young
bad experience but its another lesson learned