Sorry if this is posted in the wrong spot. I was sitting in the room where the tank is, I hear a noise and see the water move like something settled or shifted. I look at the home made stand, everything seems to be okay. The tank itself though has about a six inch crack on the plastic piece that surrounds it on the bottom. There is a crack on the side and the back bottom plastic section. Does this plastic hold the glass together? I don't know if these cracks were there before since I bought used. I supported the stand just in case that's what it is. Is my tank about to bust open on me? Please send all your help. Thanks.