Hello everyone, I'm new to these forums and a new to betta fish also. I've had one for about 3 weeks now.
I bought a heater, a marineland stealth pro for up to 3 gallons which is the size of my tank. I used it for one day and noticed the temp in the tank went up to 82 and was still climbing so I unplugged the heater. I've noticed that even without the heater the water still goes up to 84 during the day time so it wasn't the heater that day. My house usually doesn't go below 78 during the summer except maybe a bit below that during the night. The last couple mornings when I woke up I noticed that the temp was down to 74-75 so I decided to try the heater again. But this morning when I woke up the thermometer said 88. Is the heater broken or is this how they work? The instructions said that the heater came preset at 78 and I was under the impression that it is supposed to shut off when the water hits that point.
Thanks for any help