I have a 20 gallon tank vivarium which is not filled with water and is only 1/5 filled with substrate, rocks, etc. I keep my tank on my bookshelf next to my window and occasionally move it to my desk where the outside air can flow into the tank.
Recently, I noticed that a line formed in the middle of the tank casing (the black part of the tank found on the top and bottom of the tank). I believe that this line formed because of my moving of the tank around and so the pressure when I move the tank builds up in the middle of the tank.
Will my tank crack and explode if I keep doing this? I watched some videos online and read some other posts saying that the silicone may weaken if you move your tank around too much. Is this true?