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so i just started a fish in cycle in my tank yesterday and i had the temperature at 78 degrees and i woke up this morning and it is down to 68.9 i am freaking out and i have no idea what to do.
Dont panic! Obviously something is up with your heater but it is not going to stop your tank from cycling unless your temps get down in the low 50 degree range. I dont use heaters (coldwater fish) & have successfully cycled tanks with no problem. It may not be the 'ideal' temp to grow bacteria but your tank will still continue to cycle.
Umm maybe a little ot but we have those stick on the outside heaters and one seems very accurate (matches internal thrermo) but the other I have my doubts about. Are these generally accurate?