Hello, I have a 29 gallon tank that stays at 80 degrees pretty much no matter what. I turn the lights off, the heater has been off for weeks and I keep my house around 74 degrees all day and night. Is this normal? The only equipment I have running are the canister filters. I know I can bring the temps down by using ice, but I am puzzled by why the temps just won't go down. Any feedback would be appreciated. Thanks!