Umm... I don't know where you found tape that stays completely stuck to anything after being heated, because that's what you'd need to seal the top completely.

I use tanks, and I have the screen tops covered with foil and that topped with duct tape leaving a 6" square for ventilation and a @9"x5" rectangle with plastic for light. After only a week or so, the tape around those openings dried from the heat and the layers lifted, allowing air to circulate through the whole screen.

The point of covering the lid, whether you use foil and tape or a thick towel or plastic, is to prevent the heat from escaping since hot air rises. Yes, you should allow for air circulation which is why you leave 1/4 of the screen uncovered.