over the aus spring/summer (sep->feb) my tank was hardly below 31C with peaks lasting a week at a time to 35C. i observed no distress or otherwise to my fish (even my peppered corys) and suffered no casualties. and i live in a more temperate part of aus. dont know what the concern is.
also
r an easier method turn the stat down on the heater a few C then you will still have what your looking for thats what ive done today
that wont work if the ambient temperature is above ur desired temperature
