Help. I just set up my first 55 gal tank. The stand I bought is a black iron frame with the L shaped legs in the back and a more rounded design for the front two legs. With two brackets on the bottom connecting the base. All pre soldered . I did no assembly. The tank is level and centered on it. But is is kind of shaky. The whole thing will sway a little with any move movement. Not like it is going to fall over at any moment, but more as if you can see it move when you walk by. It is on a hard floor. Is this normal. Or should I empty it out and get a different stand. Please I really need help. I don't want some thing unsafe for my fish or my children