My neon tetras started dying from an hour ago.. the temperature was around 60.. so i started the heater to make it around 70.. but they still keep dying.. just bought them y'day.. What may be the reason?
Constant temp is more important-- so jumping ten degrees in a short period of time won't do your fish any favors. You'd be better off raising the temp over at least 12 if not 24 hours.