As the title implies my 55G sounded like a small gun shot, it certainly got my attention. I looked over at the aquarium and all seemed fine. I figured it had to be something so upon closer inspection the top center strap had broke off causing the aquarium to bow out out about an inch one both sides. Here it is 3:00am and I'm on the verge of a flood. Here's the kicker I had just bought a new 55G two days since Petco was running one of there 60% sales and was waiting on the stand which arrived yesterday. So I did have a solution to my problem, but now I'll probably go back and get another 55G or 75G because that was gonna be my new tank. I literally hate being half asleep putting a stand together, transferring all this crap over in the dead of night, I did notice the Aqueon tank center strap was more beefer and about twice as big. Lost 2 angelfish maybe more. I forgot to turn the air pump on so I woke up to fish gasping for air so far as I can see, the tank is still somewhat cloudy.