It may not have been enough to kill directly, but might it have been enough to decrease the 02 in the water enough to kill? He was breathing very rapidly. Just seems to me that the other critters would have died too due to lack of 02, or would they?
Other than that, he had no normal reason to die. Plus, if the heater is factory set to 78 and goes up past 82 overnight (much cooler at night) then something aint working right. Cant trust a heater that does that.
I have the mini Hydor 7.5w heater, but it has no turnoff. Seems id have to buy a temp controller to use it and that just seems nuts. :p Maybe I could put it on a timer and adjust accordingly such that the temp never exceeds 80F and never drops below 76F? Or something like that...
Cant find anything else that will fit. I could put the deffective heater on a timer I guess...Just seems scary to play with poison like that.