<< Maybe, with a 35% water change, if you used water additives to neutralize
chloramines, you had a sudden pulse of ammonia in the tank from liberating
the amines off of the chlorine. The situation sounds suspiciously like some
kind of nitrogen imbalance.
>>
I would check the chloramine possibility. I have lost fish after a water
change and found that I had not sufficiently neutralized the chloramine. I now use
sodium thiosulfate to break up the chloramine and then Amquel or Stresscoat
to catch the liberated ammonia.
Lee Harper
Media, PA
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