Is my aquarium temperature fluctuation dangerous?

I have a 23.5g tank with a heater that's overly powerful for my tank (I keep it set on 71F, and it heats to 82F). I noticed today that it was sitting at 86F! (As I was acclimating my first fish, good timing -_-) In general my bedroom is consistently warmer than the rest of my house (Even with no direct sunlight, blinds, and a blanket over the window), could this have something to do with it? During the day I am not usually home to monitor it, as I work. Should I be worried about a 4 degree fluctuation with zebra loaches? (They have a wide temp range: 72-86F) I don't want to come home one day and see my thermometer at someo ridiculous temperature, while my fish are suffering :/ Is my Hydor Theo heater too powerful? (Believe its the 150 or 200w model. I threw away the box, whoops :<) Help <3



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