This maybe a vague or weird question, but does anyone know how strong/tough/stable is a TRUVU tank? A friend of my mine sold me his TRUVU 125 gallon (72wx18dx20h) and it's problem about 5 years old. When I filled it with water and rocks what look like from a side view is that the acrylic is bent ( bowing from top to bottom). Is this normal? I will take a picture later in the afternoon.