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Posted the numbers above, substrate was recently changed as well. Tank is a small 5 gallon tank I've had for a year, with the same fish for most of that year. More or less looking for causes of such symptoms.
Parameters
The water parameters are good, we had done a half tank water change the next day one out of the three fish we had had already passed overnight. Did another quarter water change woke up to another dead fish the next day. Have not touched the water since but the last fish seems like he...