I just got a male betta yesterday and my thermometer said the temperature was at 78-79 degrees Fahrenheit. Today I checked the temperature and it's 81 degrees. If the temperature continues to rise, do I take the heater out? Or would it get too cold then? The heater is an Aqueon flat heater, and I believe it's the 15W one. It said it was ideal for tanks up to 10 gallons, and my betta is in a 5.5 gallon tank. The smaller one said it was ideal for up to 3 gallons, so I got this one. What temperature is too hot for a betta? If it rises above this temperature, should I take the heater out even if I won't be able to get another one for a while? Is there a better heater I could use?