Yeah, most plants are highly versatile. I've had plants growing from as low as 72C up to 88F....the range is likely greater, but that's the range I've personally grown in.
FYI, those digital thermometers are known to be widely inaccurate. I've had 2....one was 5 deg high, and the other was 12 degrees low. The second led to a mass wipeout of my tank as I kept turning up the heater because the digital thermometer read so low. I recommend el-cheap $2 glass/ethanol thermometer.
Thanks for that....