Heat Wave

Over the last few days we have been having a heat wave here and I noticed that the temperature has gone up by a whole degree Celsius. I have turned the heater down in case the thermostat is not working. Hope the guests are coping with the increase in temperature as it is getting close to their maximum range. So far all we have seen is more activity than usual, but no signs of distress. If it goes up any more and starts to cause them distress, I will have to either do a water change or add ice blocks to cool them down.