hi I'm very new to the aquatic world, for now lol, and I had received a used 55 gallon tank...I looked up how to clean it and after I filled it up to test for leaks, etc, I noticed that the top-middle of the long sides was expanding outwards...which is making me very uneasy to continue to leave the water in it. I did further research and never even knew about a top brace much less anything else as far as 6mm glass is definitely not enough support and yeah.. Anyways how do I go about fixing this? Is there any where's I may be able to find a brace for it or is this aquarium done for good?