The foam tape I'm talking about goes on the inside of the lid and just adds thickness. It's usually used for an insulation seal. It's not duct tape or scotch tape. There is no chance of the snake getting stuck to the tape. I have stacks of books on top of the tank, I can only clip one side down, the other side of the tank doesn't have a lock hole. There is about a 1/4 inch gap between the lid and tank. I wish I was home so I could show you a picture.