Just a quick question. I currently have a 25 watt heater for my 5.5 gallon tank. It works great when the outside environment (heater for house) is on. I keep my house temperature around 69 degrees F. The tank has no problem reaching 80 degrees in this condition.
However before going to sleep, I turn my heat off to about 60 and I notice that the tank can drop up to 76 degrees. I have to turn my heat off or else the room will become suffocating and dry (I have sinus problems and keeping the heat low at night helps). Not really an option to move the tank anywhere because this is pretty much the same throughout the house.
My main question: Is this temp fluctuating too much so when I do get a betta he/she will be irritable? Is it ok? healthy? normal?
Is there a way to combat this? Maybe putting a towel over the tank at night so the heat won't escape?
Any input is greatly appreciated!