I use a stick on one and while it may not be the most scientific it is close enough. Just do not let the temperature go above 81 unless Shadow is sick. If you see it is getting too hot just turn the light off and turn the heater down a degree and leave it for the rest of the day. Summer is coming and the tanks can heat up whether they are being heated or not and sometimes our little friends are going to get warm but if that happens we can do a partial water change to help cool them but not too fast. Just a degree or two at a time.

I usually turn my air conditioner on at 80 degrees and turn the heaters down to below 75 for the summer but I realize that you do not have control of your air conditioner so do the best you can by turning the heater down to around 75 or 76 and know that the little guys tank will probably stay above 78 or 80 even then. If it starts to go above 82 then do a little water change with water that feels just comfortably cool to you not cold and not more than about 2 gallons of water in your tank at a time. You can do one water change at any one time and then wait for several hours to see if it took care of the problem.

Remember the temperature raising and lowering all the time will be harder on him than him getting used to a steady temperature even if it is a bit higher than he wants it.

Try not to worry too much and just enjoy Shadow.

Rose