I have a Aquapod 12 gallon and I need a fan replacement! I am going out of town soon and now my fan is starting to make a horrible sound. I am scared to death that this fan is going to burn down my house while no one is here for a couple of days!!! I also need to know how in the world to get the top off the tank so I can replace this fan. I would not mind replacing it with something quieter than what it was when it did work! Can anyone please, please, please help?