I can't figure out what is causing my tank to be up to 81F degrees. I thought my heater might be broken so I went out and bought a new Fluval M300. I was using a Aqueon 200 Watt heater. Now my Fluval is a 300W as it says it's good for an 80 gallon tank. My tank is 55 gallons.
I have two thermometers. Ones digital and another is a glass one. Both read the same. I ordered two more new ones today. A new Glass one and a new Digital one. To see if they all four match.
I have the heater fully into the tank. It's sideways that way when I do water changes it will never not be underwater. So what could be the issue? My thermometers could be broken, but both? I thought my LED
light strip could be doing it, but the temp is the same at night when they lights are off.
When I do water changes it registers a temp drop, so I don't know what else could be causing my water to be heated so high. My fish don't seem to mind, they are use to it I guess.
I want my tank to be at 76 degrees, but it stays at a 80 to 81 degree temp.