bloody heck you lot, its only England!
the heatwave lasted all but 2 days.
the heatwave lasted all but 2 days.

that wont work if the ambient temperature is above ur desired temperaturer 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
i mean before the mid day heatover 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
that wont work if the ambient temperature is above ur desired temperaturer 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
I would recommend using this
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It's very accurate and displays down the the 00.0°C which in turn allows to you track even minor fluctuations.
Using this thermometer I found that with the curtains and door closed my tank drops 0.4°C when both are open it jumps 0.8°C