Matt,
First sorry about your loss. I do not use stress coat (safe usually) but if you had stress coat left over did you try an experiment with some feeders or something to determine it was the conditioner (i.e. condition some tap and put a couple goldfish in to see if they die)? No offense but there could be other factors, like water chemistry that day ( a lot of salt in the groundwater from all the snow) temp fluctuation maybe. Me personally I would want to prove my theory.
First sorry about your loss. I do not use stress coat (safe usually) but if you had stress coat left over did you try an experiment with some feeders or something to determine it was the conditioner (i.e. condition some tap and put a couple goldfish in to see if they die)? No offense but there could be other factors, like water chemistry that day ( a lot of salt in the groundwater from all the snow) temp fluctuation maybe. Me personally I would want to prove my theory.